2. Passengers must pass through metal detectors, and their carry-on bags are put through X-ray machines. 乘客必须通过金属探测器检测，其随身物品也必须经过X射线设备检测。
3. The item was in his carry-on during X-ray screening at a security checkpoint at the airport, an FBI spokesman said in a statement. 美国联邦调查局发言人在一份声明中说，在机场安检处进行 X 光安检时，该可疑物品就在他随身携带的行李中。
4. Another factor may be that more people are trying to overpack their carry-on bags to avoid checked baggage fees, though the airlines strongly dispute this. 另一个可能的原因是，虽然航空公司强烈反对，但更多的人还是会为了逃避托运行李的费用，而把随身行李塞得满满的。
5. Another factor may be that more people are trying to overpack their carry-on bags to avoid checked-baggage fees, though the airlines strongly dispute this. 另一个因素可能是，即使航空公司强烈反对，还是有越来越多的人为了避免托运行李费用而试图携带过量的随身行李。
