Letters of support have been exchanged between the two leaders.

两位领导人互致支持信函。

We actually have signed letters of support with over 40 space agencies, Rachel, in 40 different countries.

实际上，瑞秋，我们已经与40多个国家的40多个宇航局签署了支持书。

Also, we love letters of support.

此外，我们也喜欢支持信。

She felt encouraged by the many letters of support.

【encourage，encouraged】许多表示支持的信使她很受鼓舞。

And, you know, if you're really feeling the love for your library, maybe you send your librarians a letter of support.

而且，您知道，如果您真的热爱您的图书馆，也许您可​​以向图书馆员发送一封支持信。