这种注射被设计成致命的，能立即导致死亡。

The injection was designed to be ___lethal and cause immediate death.

政府应避免投资于新型致命武器系统。

Governments should avoid investing in new ___lethal weapon systems.

暴露于高剂量辐射对人类可能是致命的。

Exposure to high levels of radiation can be ___lethal to humans.