飞机通过无线电地面控制塔保持联系。
The plane made contact with the ground control centre by wireless.
这时候，布鲁塞尔控制塔的官员们知道大事不妙了。
By this time, officials in the Brussels control tower could tell that something was very wrong.
不远处安装的入门是一个控制塔和一个直升飞机平台。
Not far from the installation's entry gate are a control tower and a helicopter pad.
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