by luck

侥幸地

例句与用法：

Please inform me by letter of your plans.

请来信把你的计划告诉我。

You may apply for tickets in person or by letter.

需票者可亲自来申请亦可来信索取。

You should apply immediately, in person or by letter.

你应该立即申请，亲自去也好，写信也好。

Reservations can be made by letter or fax.

可以来信或传真预订。