1. In many cultures the most common form of first contact between two people is a handshake.
    在许多文化环境里，两个人初次接触的最常见的方式就是握手。

2. If today I use a singular personal pronoun to refer to myself, next week I will use the plural form.
    如果今天我提到自己时使用的是单数人称代词，那么下星期我就会使用复数形式。

3. For them discipline in one form or another is the most hopeful path.
    但这是徒劳的。对他们来说，用某种形式的纪律约束他们一下才能有希望使他们走上正道。

4. For most of the earth´s history they have been the only form of life on our planet.
    在地球上发展的大部分进程中，细菌是地球上唯一的生命形式。

5. Foreign nationals have another, longer form to complete before being granted a U.S. entrance visa.
    外国人在获得入境签证之前所填的表格更长。

6. Fatigue and poor performance may begin to appear in the second stage of deficiency, when not enough iron is present to form the molecules of blood protein that transport oxygen to the working muscles.
    到了缺铁的第二阶段，就会出现疲倦和力不从心，此时体内已没有足够的铁来形成血蛋白分子，将氧输至运动着的肌肉。