奶奶寄来的那些信终于到了。
The letters that were sent by my grandmother finally arrived.
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that英 /ðæt/|美 /ðæt/
were英 /wɜː/|美 /wər/
sent英 /sent/|美 /sɛnt/
by英 /baɪ/|美 /baɪ/
解释
关系从句中，that 指代 letters 引导从句，were sent 构成被动语态，by 引出施动者 my grandmother。
The letters that were sent by my grandmother finally arrived.
关系从句中，that 指代 letters 引导从句，were sent 构成被动语态，by 引出施动者 my grandmother。