求翻译：请选择大小合适的安全头盔，调整好位置后将锁扣扣上，扣锁扣时谨防夹伤，并确保安全头盔途中不能脱落。是什么意思？

Please select a size appropriate safety helmet, adjust the position after locking buckle, buckle lock to guard against entrapment, and to ensure the safety helmet on the way can not fall off.

Please select the appropriate size helmet adjustment of the position, will be the buckle down, when you would like to buckle latch-pinching, and make sure that your helmet will not fall off.

Please choose the size appropriate security hard helmet, after adjusts the good position to fasten the lock catch, buckles when the lock catch guarded against clamps the wound, and guarantees the security hard helmet not to be able to fall off on the way.

Please select a suitable safety helmet, when the position is adjusted on the lock picks, guard against injury when the buckle latch, and ensure that safety helmets cannot fall off along the way.

正在翻译，请等待...