一套钥匙的英文为a set of key、a bunch of keys、Cellar Key、a set of keys、couple of keys。
语法：一套钥匙用英语是“复数”。一套钥匙用英语表达可以是：A bunch of keys，或是：A set of keys，因为一套钥匙中钥匙一定是超过“一把”的，所以是要用复数的。
双语例句：
1、失物招领处有一套钥匙。
There's a set of keys in the lost and found case.
2、我用一个类似于一套钥匙，这是他最喜爱的。
I used one that resembled a set of keys;it was his favorite.
3、好的，我有一串钥匙和一些硬币。
Yes,I have a bunch of keys and some coins.
4、T-Bag的脚踩到了一串钥匙上。
T-Bag’s foot steps on a set of keys.
5、桑尼在门外发现了一串钥匙。
Sunny found a bunch of keys outside the door.
6、有一串钥匙，一个指甲刀。
A string of keys and a nail clipper.
7、小严有一串钥匙。
Xiao Yan has a set of keys.
8、他从墙上的木板上拿起一串钥匙，打开拘捕室。
He opened the door of the cell with a bunch of keys he picked up from a wooden board nailed to the wall.
9、一串钥匙在失物招领箱里。
Lost and found in the lost and found case a set of keys.
10、他的左耳朵上夹着一根香烟，皮带上挂着一串钥匙。
He kept a cigarette behind his left ear and a ring of keys hooked to his belt.