“是的，我们决不能落后，”他们都点点头。 但请注意，如果 I shook my head的前面没有表示否定涵义的词not，则仍作“我摇头表示不同意”解。

"No, we mustn't," they all shook their heads.

youdao

我不够坚强所以我没有反驳你，我只是点点头露出勉强的微笑。

I was not strong enough to disagree with you and I nodded my head with a forced smile.

youdao

她点点头，但没有抬头看我。“我真不明白是什么使你心烦意乱。”

She nodded but she did not rise. 'I don't really understand what's upsetting you.

youdao