1·You will be notified by letter.
将用信函通知你。
—— 《牛津词典》
2·Your job is to group them by letter and put them in numerical order.
你的工作是把它们按字母编组，再把它们按数字顺序排序。
—— 《柯林斯英汉双解大词典》
3·I will contact you by letter.
我会给你写信联系的。
—— 《牛津词典》
4·We are in regular communication by letter.
我们定期通信联系。
—— 《牛津词典》
5·Complaining in person or by letter is generally more effective.
当面投诉或写信投诉通常更有效。
6·If your complaint doesn't require an immediate response, it often helps to complain by letter.
如果你的投诉不需要立即答复，那么写信投诉通常比较好。
7·We pay by letter of credit.
我们用信用证付款。
8·I told her my arrival by letter.
我写信把我到达的日期告诉她。
9·You may apply __ tickets in person or by letter.
需票者可亲自来申请亦可来信索取。
10·You may apply for the job in person or by letter.
你可以亲自到场或来信提出申请这项工作。