他在帮妈妈做饭
He is helping his mother cook
以上为机器翻译结果，长、整句建议使用 人工翻译 。
当雨水开始猛烈地敲打窗户的时候，本正在帮助他的妈妈做饭。
Ben was helping his mom make dinner when the rain began to beat heavily against the Windows.
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