Tray usually refers to a JEDEC standard matrix tray measuring 12.7x5.35 inches and either 0.25 or 0.40 inches tall. Trays are usually constructed from plastic, but aluminum is permissible. JEDEC trays contain slots to allow air to pass vertically and are rated for at least 140°C to allow drying of parts in industrial ovens. Trays are stackable and feature a chamfered corner indicating the orientation of pin one of the parts. Trays are packaged according to the ESD (ElectroStatic Discharge) and MSL (Moisture Sensitivity Level) protection requirements determined by the manufacturer.
除了钙，维生素D也很重要，因为它帮助身体将钙吸收并保留在骨骼中，让骨骼强韧。
In addition to calcium, Vitamin D is important because it helps the body absorb and retain calcium in the bones, making them strong.
美国联邦调查局（F.B.I.）实施超过200条联邦法律，但它目前两项最重要的工作是防止恐怖主义与间谍。
The F.B.I. enforces more than 200 federal laws. But its two most important jobs now are to prevent terrorism and spying.
这些遗骸在高压下被长时间深埋在岩石层下面。
These remains were buried deep below levels of rock over time and under great pressure.
美国联邦调查局（F.B.I.）有大约2.7万名员工。他们在美国的56处以及美国以外的40处办公地点工作。
The F.B.I. employs about 27,000 people. They work in 56 offices in America and more than 40 offices in other countries.
美国各大学的酒精管理条例都不一样。
Rules on alcohol differ from college to college in the United States.
公司是一种有效期无限长的商业机构。
A corporation is a kind of business organization with an unlimited lifetime.
类似地，足够的运动现在也被视为另一个保持骨骼结构与密度健康的重要因素。
Similarly, sufficient exercise is now seen as another vital factor in maintaining healthy bone structure and density.
饱和脂肪在常温下是固体，经常来源于动物。
Saturated fat is generally solid at room temperature and is usually from animal sources.
这些饮料和与之含有相近卡路里的食物相比，不会引起同样的饱腹感，所以增加了过度进食的风险。
These drinks do not trigger the same sense of fullness as food with similar calories, increasing the risk of overeating.
公司可以出售股票作为筹钱的方式。股票代表对公司的部分所有权。
Corporations can sell stock as a way to raise money. Stock represents shares of ownership in a company.
众议院可以提出针对税务或开销的法案。
The House of Representatives can introduce bills that deal with taxes or spending.
大部分健康的成年人每天需要0.5到3升的水，所以每天需要喝6到8个中等玻璃杯的水。
Most healthy adults need between 0.5-3 litres a day, so aim to drink 6-8 medium glasses of fluid daily.
石油的现代历史开始于19世纪中期。当时人们发现了一种从汽油中提取煤油燃料的方法。
The modern history of oil started in the middle of the 1800s. At that time, a method was found to make kerosene fuel from petroleum.
破产法第十三章要求人们要有偿还债权人的计划。他们要在三到五年内一直向债权人进行支付，直到欠款基本还清。
Chapter thirteen bankruptcy requires people to have a plan to repay their creditors. They make payments for three to five years until most of their debt is paid off.
除了将世界各地不同风味的食物融合到一起，英国也有自己绝不平淡无奇的传统烹饪品牌。
As well as blending different foods and flavours from all over the world, Britain has its own brand of traditional cooking that is anything but bland.
你可以找到关于如何以及何时申请、花费多少以及有否有经济援助的信息。
You can find information about how and when to apply, how much it will cost and whether any financial aid is available.
身份窃贼运用多种手段获得他们想要的信息。
Identity thieves use several methods to get what they need.
破产是负债的人或者企业的合法程序。
Bankruptcy is a legal process for people and businesses that are in debt.
这些液体来自数百万年前死亡的动植物的遗体。
The liquid comes from the remains of plants and animals that died millions of years ago.
申请过程本身就极其复杂，大多美国学生只能在学校指导员、父母以及同学的帮助下处理此事。
The application process itself is a labyrinth that most American students approach only with the help of school councilors, parents and peers.
提前考虑如何反驳总是好的。对方就不能难倒你，你也总是准备充足。
It's always good to consider the counter-arguments in advance. That way the other side can't catch you out and you're always prepared.
如果股份下跌，投资者可能会失去所有他们当时买股票的钱。
If shares lose value, investors can lose all of the money they paid for their stock.
你可以在我的俱乐部以优惠的价格买到各种维修箱与工具箱。
You can get all kinds of repair kits and tool kits at my club at a favorable price.
一些词语虽然描述的是同样的事物，但是暗示着相关方面之间的不同关系。
Some groups of words describe the same actions, but imply different relationships among the parties concerned.
华裔美国人只占美国人口很小一部分，他们主要生活在加州、纽约和夏威夷。
Chinese Americans make up only a tiny fraction of the American population. They live chiefly in California, New York, and Hawaii.
讲座和我现在所做的非常相似，就是一个人跟你们所有人谈论一个主题。我们非常想让你们来参加这些讲座。
A lecture is rather like what I am doing now, where one person will talk to all of you together on a subject. We do ask you to try to attend the lectures.
每个社会都要求人们遵守习俗，如果有人违反习俗，可能会招致严厉的惩罚。
Each society demands obedience to its mores, and violation can lead to severe penalties.