具体用法：
1. 表示说服、劝告的意思时是不可数名词：
They are putting pressure on people to vote yes.
I was under pressure from my parents to become a teacher.
2. 表示焦虑或工作过度时是可数与不可数名词：
I feel I'm not able to cope well with the pressures of life.
3. 表示引起变化或改变时是可数与不可数名词：
inflationary pressures
Analysts expect the pound to come under pressure.
4. 表示重力时是不可数名词：
The pressure of the water turns the wheel.
5. 表示气体或液体的压力时是可数与不可数名词：
The gas containers burst at high pressure.
6. 在气象中表示地球大气影响天气时是可数与不可数名词：
A ridge of high pressure is building up strongly over the Atlantic.