01 between you and me
你我之间 ×
就我俩知道(保密) √
It's between you and me, don't tell anyone else.
这事就你我知道,别告诉其他人。
02 between them
在他们之间 ×
一起 √
Between them, they saved enough money to buy a car.
他们一起存钱买了一辆车。
03 in-between
中级的√
He's at the in-between stage, neither a child nor an adult.
他处于中级阶段,既不是孩子,也不是成人。
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