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1·I'll leave it to competent authorities.

你可以向主管部门了解。

2·A: I suggest you refer this to competent authorities.

答：这个问题，建议你向主管部门询问。

3·I suggest you refer this question to competent authorities.

答这个问题我建议你向有关主管部门了解。

4·I suggest you refer to the competent authorities for the specifics.

建议你就此事向主管部门去询问。

5·Please refer to competent authorities for specifics of the visit.

关于访问具体情况，请向主管部门询问。

6·This is an economic issue. I suggest you refer it to competent authorities.

这是一个经贸问题，建议你向主管部门询问。

7·As to the details, I advise you to refer to the competent authorities.

相关情况建议你向有关主管部门了解。

8·On the specific figures you mentioned, I suggest you refer to the competent authorities.

有关你提到的具体数字，我建议你向主管部门了解。

9·The specific matter certainly requires communication between competent authorities on both sides.

当然，具体事宜还需要双方主管部门进行沟通。

10·If I had space I could quote numerous passages to this effect from highly competent authorities.

如果篇幅允许，我当引证有能力的权威作者对于这种效果的许多著述。