by 1 (b)
prep.
1. Close to; next to: the window by the door.
2. With the use or help of; through: We came by the back road.
3. Up to and beyond; past: We drove by the house.
4. In the period of; during: sleeping by day.
5. Not later than: by 5:30 p.m.
6.
a. In the amount of: letters by the thousands.
b. To the extent of: shorter by two inches.
7.
a. According to: played by the rules.
b. With respect to: siblings by blood.
8. In the name of: swore by the Bible to tell the truth.
9. Through the agency or action of: was killed by a bullet.
10. Used to indicate a succession of specified individuals, groups, or quantities: One by one they left. They were persuaded little by little.
11.
a. Used in multiplication and division: Multiply 4 by 6 to get 24.
b. Used with measurements: a room 12 by 18 feet.
c. Toward. Used to express direction with points of the compass: south by east.
adv.
1. On hand; nearby: Stand by.
2. Aside; away: We put it by for later.
3. Up to, alongside, and past: The car raced by.
4. At or to one's home or current location: Stop by later today.
5. Into the past: as years go by.
Idiom:
by oneself
1. Without company; alone: went by herself.
2. Without help: wrote the book by myself.
by 2 (b)
n.
Variant of bye.
还有谚语呢。。。。
by后接名词的话,则用单数.
参考资料：自己
http://www.dreye.com.cn/里看看啊 ？
参考资料：http://www.dreye.com.cn/
