英文翻译： 我们正在向海关申请当中 一旦有效会马上通知你

Our application to the customs is in process. We will inform you as soon as it is accepted.

We're applying for the XXX . We'll inform you as soon as possible when the XXX is valid.


翻译如下：We are apply for the custom,I will inform you as soon as it is in effect .
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杭州图书馆

Our application for xxx fromm the customs is in process and we will inform you as soon as it becomes valid


application 后面如果用 to 表示申请某物 我想应该是向海关提交了申请 而不是申请海关 所以楼上的直接用 to 肯定不对

你的问题可能有两种情况.
1.如果申请已经递交给海关了,可以说：Our application to the Customs is in the process of examination. We shall inform you of the result as soon as possible.
2.如果申请还在书写中,尚未交给海关.也是“正在向海关申请当中”.
这时,可以说：We are making application to Customs for the issue and we shall inform you of the result as soon as possible.