She set out the reasons for her resignation in a long letter.
她写了一封长信说明自己辞职的原因。
Rules and regulations, once set up, should not be turned into a dead letter.
规章制度一经订立，不应成为一纸虚文。
The first set, [A-Za-z], represents any letter.
第一个集合 [A-Za-z]表示所有字母。
A letter from home set off an attack of homesickness.
一封家信勾起了一阵乡思。
The letter from her mother set off an attack of homesickness.
妈妈的来信勾起了她的一阵思乡之情。
Only the King's letter could set him free.
只有国王的亲笔信才能释放犯人。
Only the King's letter could set him free.
只有国王的亲笔信才能释放犯人。
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