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1·Who's he?—God knows.

“他是谁？”—“天晓得。”《柯林斯英汉双解大词典》

2·Who's he? He's my grandfather.

他是谁？他是我的爷爷。

3·Who's he brought to dinner?

他带谁来吃饭了？

4·Who's he protecting?

他到底是在保护谁？

5·Oh, who's he talking to?

哦 他在跟谁说话?。

6·Who's he? He is Mike.

他是谁？他是麦克。

7·Who's he talking to?

他在和谁说话？

8·Hi, Mike. Who's he?

你好，麦克。他是谁？

9·Bella: Who's he?

贝拉：他们是谁？

10·Who's he? the chubby man asked, his eyes huge with fear.

“他是谁？”胖男人问道，眼中满是恐惧。