1
put [sth] in the letter box
I put the mail in the letter box.
我把信件放进了信箱。
邮筒；公共邮箱
先理解核心含义，再看它在真实句子里的用法。
邮筒；公共邮箱
a public box for posting letters
I put the mail in the letter box.
我把信件放进了信箱。
英式英语常指街头投寄信件的邮筒；美式英语常用mailbox
私人信箱
a private box for delivery of mail
邮政信箱
a numbered compartment in a post office where mail is put to be called for
邮筒；公共信箱
public box for deposit of mail
I dropped the envelope into the letter box on my way to work.
我在上班的路上把信封投进了信箱。
The letter box at the entrance is full, so the mail carrier might not deliver today.
入口处的信箱已满，邮递员今天可能不会投递了。
Please check the letter box; I'm expecting a package.
请查看一下信箱，我在等一个包裹。
I put the mail in the letter box.
我把信件放进了信箱。
Please check the letter box for any new letters.
请检查信箱是否有新信件。
常用的描述性结构，如 full, empty, broken 等。
The letter box is empty today.
今天信箱是空的。
Not this
I put the letter in letter box.
Use this
I put the letter in the letter box.
中文学习者常因汉语中无冠词而遗漏冠词。英语中可数名词单数前需要冠词，所以“letter box”前应加"the"表示特指。
Not this
There are many letter box in the street.
Use this
There are many letter boxes in the street.
汉语中名词复数不加词尾，学习者易忘记加-s。英语中可数名词复数需加-s或-es，此处“letter box”的复数形式是“letter boxes”。
Not this
He dropped the letter to the letter box.
Use this
He dropped the letter into the letter box.
汉语中用“到”表达方向，但英语中“drop into”表示投入，介词“into”强调进入内部，而“to”仅表示方向，不强调进入。
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Dictionary facts from ECDICT, WIKTIONARY.