封面是有担保与反篡改的安全螺丝。
联邦安全规则要求，玩具使用的电池要有电池仓，并且要用螺丝将其锁定。
Federal safety rules require toys that use the batteries to have battery compartments that are locked with screws.
安全牢固：武汉运动围挡在施工过程中遇硬表基用加长膨胀螺丝固定墙柱，软表基用深坑配重墙柱。
Wuhan strong safety enclosure meets a hard base table with extended expansion screws fixed wall column during the construction process, the pit wall column with soft base table weight.
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