by letter

基本解释

The cell selection from the initial cell pool is done by letter affinity.
從初始細胞池中對細胞的選擇由字母關聯性來完成。
At first she did phone her sister and me occasionally, but for the past year has wanted contact only by letter.
開始的時候，她確實時常的給她的妹妹與我打電話，但是這幾年她要求我們衹通過書信聯系。
That model went as follows: a small number of columnists opined on politics, culture and events. The readers responded by letter or email: a tiny proportion of that response saw the light of day.
這種模式如此進行：幾個專欄作家對政治、文化和時事發表意見，讀者通過信件或電子郵件作出響應—衹有極小一部分響應會得見天日。

The sign is formed by a line across the right foot of the letter "R."
Here's a copy of a letter to Pound by Yeats when they were both living in London.
這有一份葉芝寫給龐德的信,他們儅時都住在倫敦。
耶魯公開課 - 現代詩歌課程節選
Ephesians was written by a different disciple of Paul, and he was using as his model for a Pauline letter the actual letters of Paul, or at least some of them that he possessed and knew of.
以弗所書則由保羅的另一信徒執筆，他偽造保羅的書信,模板是保羅的書信，或者他所持有的一些保羅的書信。
耶魯公開課 - 新約課程節選

When encountering an unknown word in kindergarten, we were told to sound it out, understanding it letter by letter.
FORBES: American Political Economy Is No Different From English Language