It’s no good/use… -ing and It is worth …-ing.常用-ing, 其他时候为非正规表达。
1) It’s no good talking to him – he never listens.
2) It’s no use expecting her to say thank-you.
3) It’s no use trying to explain – I’m not interested.
---- It's raining now. --- 现在下雨了。
“现在进行时”
基因工程中的
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