Before going on board the plane, the passengers have to go through the security check.
Before going on board the plane, the passengers have to go through the security check.
正确答案：旅客在登机前必须接受安全检查。
Before going on board the plane, the passengers have to go through the security check.
正确答案：旅客在登机前必须接受安全检查。
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