是no lesson还是no lessons

是no lesson还是no lessons no lessons的中文 no lesson是什么意思 是no pains,no gains还是no pain,no gain? 是no pains,no gains?还是no pain,no gain? 是no pain no gain还是no pains no gains? I have no lessons today number 的缩写是NO.还是No. 是NO smoke还是No smoking 是 no talk 还是no talking 到底是yes 还是no ? 英语翻译是no pay no gain 还是 no pain no gain