against的用法（against的词性含义和用法）

Against:
这个词是个介词
1. “逆着，对着，顶着”
They were rowing against the current.
他们逆水划船。
The ship won’t strike against a rock.
这首船不会触礁。
Heat is produced when work is done against friction.
克服摩擦作攻时，产生热。
2. “反对，违反”
This explanation is against the natural laws.
这个解释是违反自然规律的。
There is a regulation against smoking in the office.
办公室禁烟。
Americans were against the proposal.
美国人反对这项建议。
3. “靠着，相对”
The photo hangs against the wall.
这张照片挂在墙上。
Against the post office there stands a hospital.
邮局对面是一家医院。
The shop is against the school.
商店在学校对面。
4. “对照”
3 against 2
3比2
The trees were black against the morning sky.
在早晨的天空的映照下，那些树是黑的。
The school has 100 students this year，as against the 80 last year.
这所学校今年有100个学生，而去年只有80个学生。
5.“以防，以备”
We store up vegetables against the winter.
我们储备蔬菜以备冬用。
We must guard against disease.
我们必须预防疾病。
Save money against a rainy day
未雨绸缪