strain 
英 [streɪn]  美 [streɪn] 
n. 张力；负担；扭伤；损伤；血统；品种；气质；特性；风格；乐曲；格调；口吻

v. 耗尽；损坏；变形；扭伤；滥用；过滤；渗出；搂紧；竭力；歪曲；拉紧

例句：
This policy puts a greater strain on the economic system than it can bear. 

该项政策给经济体系带来了难以承受的压力。

The vast expansion of secondary education is putting considerable strain on the system. 

中等教育的大幅扩张给体制带来巨大压力。

He's been under a lot of strain. 

他一直在承受巨大的压力。

the credit crunch caused by strains on the banking system 

因银行系统压力过大而引发的信贷紧缩