The airline's security policy bans any item that could be used as a projectile onboard.

該航空公司的安全規定禁止攜帶任何可能在機上被當作投擲物的物品。

Workers on the loading dock must wear helmets to guard against falling projectiles.

裝卸平台的工人必須戴安全帽,以防掉落的拋射物。

The safety report noted that broken machine parts became dangerous projectiles during the malfunction.

安全報告指出,故障期間斷裂的機器零件變成了危險的拋射物。