为你解答。
1、我盼望着收到您的电子邮件。
I [look] [forward] [to] [receiving] your e-mail.
2、直到他父亲告诉她，海伦才知道这件事。
Helen [didn't] [know] [anything] about it [until] her dather told her.
3、晚上这里的气温能降到零摄氏度以下。
Here the temperature [can] [drop] [below] [zero] at night.
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