To improve the performance, the operators must first determine exactly what is going on.

为了改善网络的性能，网络操作人员首先必须确定发生了什么问题。

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Early to get clearance certificates, owners must first determine whether to advance their own tax.

要想提早拿到完税证明，首先必须确定业主们是否可以自行提前纳税。

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To decide on the value of any target business, you must first determine what contribution your acquisition can make to it.

决定任何目标业务的价值，你首先必须决定并购所能做出的贡献。

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The 2012 trail covers approximately 945 miles, so spectators must first determine which portion of the race they aim to see.

CNN: Iditarod: A spectator's guide

Before you can understand where your costs lie, you must first determine if you are responsible for them in the first place.

FORBES: Magazine Article

According to the law, in order for the EPA to waive RFS requirements, regulators must first determine that the program is causing economic harm.

FORBES: Feds Could Lessen Drought Impacts But Don't Bet The Farm On It