Before the American satellites entered the satellite test building at the launch site, American security personnel had already checked the building many times.

——美方卫星进入发射中心的卫星测试厂房之前，美方安全人员已对厂房进行过多次安全检查。

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Before the American satellites entered the satellite test building at the launch site, American security personnel had already checked the building many times.

——美方卫星进入发射中心的卫星测试厂房之前，美方安全人员已对厂房进行过多次安全检查。

youdao