bit 侧重指微小，一点点，小碎片。
piece 最普通用词，多指从整体上分割下来的东西，可大可小。
sheet 侧重指平整很薄的一张或一片。
slice 多指切得很薄的一片食物。
fragment 指破裂的，不完整的，不可完整的碎片。
scrap 侧重指废弃的零碎之物。
参考例句
1. Rosa bit into a cream cake. 罗莎咬了一块奶油蛋糕。
2. Your assignment for this lesson is to write a simple boot program that demonstrates a bit of interactivity. 本课留给你的任务就是写一个可以显示出一点交互性的简单的引导程序。
3. This section will cost a bit extra. You will pay $100 toward the purchase of a micro-controller, actuators, etc. MIT will pay for the rest. 这部分课程需要额外的费用。你要花100美金购买一个微控制器、执行器等等。麻省理工学院会支付剩余部分。
英英解释
n.
1. a small quantity
2. a small fragment of something broken off from the whole
3. an indefinitely short time
4. an instance of some kind
5. piece of metal held in horse's mouth by reins and used to control the horse while riding
6. a unit of measurement of information (from binary + digit); the amount of information in a system ha
7. a small amount of solid food; a mouthful
8. a small fragment
9. a short theatrical performance that is part of a longer program
10. the cutting part of a drill; usually pointed and threaded and is replaceable in a brace or bitstock
