We no longer really communicate by letter, by concrete mail as such.
他说：“我们不再通过写信，通过有形的邮件进行联系。
The design is applicable to contemporary sophisticated communicate by letter system or high precision instrument.
设计方案适用于当代尖端的通信系统和高精度仪器。
I often communicate with him regularly by letter.
我经常定期与他通信交流。
We communicate with each other by letter.
我们用书信彼此联系。
We communicate with each other by letter.
我们用书信彼此联络。
We communicate with each other by letter.
我们用书信彼此联络。
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