enter for

1. 报名参加

Our team has entered for the competition.

我们队已报名参加比赛.

enter into

1. 加入; 开始

They have entered into a contract with a firm.

他们已与一家公司签订了合同。

2. 构成……的一部分

Flour has largely entered into our diet.

面粉已成为我们的主食之一。

3. 考虑; 讨论

We'll enter into the next issue this afternoon.

今天下午我们讨论下一个议题。

enter on/upon

1. 开始; 着手干

They have entered on their new duties.

他们已开始担任新职。

enter up

1. 登录; 记下

Have the payments been properly entered up?

付款已按要求记上了吗?