All existing supplies of helium ought to be conserved and released only by permit, with medical uses receiving precedence over other commercial or recreational demands.

现有的所有氦供给应该被保存下来，并且只有在获得许可的情况下才能释放，医疗用途优先于其他商业或娱乐需求。

youdao

Firstly, all existing supplies of helium ought to be conserved and released only by permit, with medical uses receiving precedence over other commercial or recreational demands.

首先，所有现有的氦供应应该被保存下来，并且只有在获得许可的情况下才能释放，医疗用途应优先于其他商业或娱乐需求。

youdao

The motor carrier administration is already considering a rule to tighten its standards for medical certification of commercial drivers.

汽车运输安全管理局已在考虑将商业驾驶的医师证明标准规定得更紧。

youdao

The American Aerospace Medical Association Commercial Spaceflight Working Group published a document in 2009 saying that most individuals with "well controlled medical conditions" could withstand the acceleration forces involved in the launch and landing of a commercial spaceflight.

BBC: What are the health risks of space travel?

Both gases are legal and have medical or commercial uses but can be lethal.

BBC: Annihilation legal high 'should be banned'

The FAA has not made any specific statements on medical requirements for commercial space passengers, the BMJ authors noted.

FORBES: Doc, Am I Fit To Fly Into Space?