cos和cosh的区别:意思不同，读音不同。
cosh
英 [kɒʃ] 美 [kɑːʃ]
n.(用作武器的）金属短棍，实心橡胶棒。
vt.用短棒打用短棒之类的东西打。
cos
英 [kəz] 美 [kəz]
conj.因为。
abbr.(书写形式）余弦。
Our side was under the cosh for most of the second half.
The home team was soon under the cosh.
主队很快就陷入被动。
Can I just ask something' cos I'm really quite interested in this.
我能不能问个问题，因为我对这个真的很感兴趣。
They wouldn't serve me in any pubs' cos I looked too young.
这些酒吧都不让我进，因为我看上去太小了。
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