订金的英文：
subscription

参考例句：

How much do I have to pay down?
我必须付多少订金？

The hotel requires a deposit for all advance bookings.
旅馆规定凡预订房间都要先付订金。

subscription是什么意思：
n. 会员费，用户费，订阅费；捐助款
adj. 收费的

They decided to raise the money by subscription.
他们决定靠募捐的办法来筹集这笔款子。

subscript variable symbo
下标变量符号

I used a subscript.
我用了脚注。

He discontinued his subscription to the magazine.
他停止订阅那本杂志。

In circumstances where there is no ambiguity the subscripts are omitted
在不会引起含糊不清的情况下，下标可以省去。