His hand up to answer 他举手回答
Afraid of being lanughed at, I never put up my hand to answer questions in English class.
害怕被嘲笑，所以英语课上我从来不举手回答问题。
She is pragmatic and always puts up her hand to answer teachers' questions.
她很活跃，经常积极举手回答老师的问题。
She put up her hand to show that she knew the answer.
她举起手以表明她知道答案…（翻译真不好干啊，还是意念比较好理解）
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