两串钥匙的英语是two sets of keys;
两串Two strings
例句:
她给儿子买了两串葡萄。
She bought two clusters of grapes for her little son.
香蕉树上有两串香蕉。
Two bunches of bananas were on the banana tree.
桌上放着几只苹果和两串香蕉。
Lying on the table were some apples and two bunches of bananas.
钥匙key
key; unlocking key:
开门的钥匙
key to a door;
万能钥匙
universal key;
一把钥匙开一把锁
open different locks with different keys; use different methods to deal with different people or problems