On the other hand, official aviation agencies and safety boards are resisting any relaxation of the present safety rules unless and until it can be conclusively shown that it would be safe to do so.
另一方面，官方航空机构和安全委员会正在抵制任何放松目前安全规则的行为，直至可以得出结论，证明飞机上使用手机是安全的。