i had to smile
我不得不微笑
以上为机器翻译结果，长、整句建议使用 人工翻译 。
I had to smile at the engineer's question.
对于这位工程师的问题，我只好无奈一笑。
youdao
I had to smile.
我只有笑笑。
I had to smile to myself. After all, I had already fallen in love with the savage brat, the parents were contemptible to me.
毕竟我已经喜欢上了这个野蛮的小东西，但却看不起这对父母。
Eventually though, when it was clearly time to go, I left with a smile on my face that remained long after I had gone.
FORBES: The Right Way to Speak to Yourself
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