Without any available cohort studies to test exposure over a long period of time, though, they have had to rely on lab studies, which failed to find any clear or reproducible biological effects.

没有任何可用的队列研究，以测试长时间暴露在电磁场中的后果，他们不得不依赖实验室研究，目前未找到任何明确或可复制的生物效应。

youdao

Without any available cohort studies to test exposure over a long period of time, though, they have had to rely on lab studies, which failed to find any clear or reproducible biological effects.

没有任何可用的队列研究，以测试长时间暴露在电磁场中的后果，他们不得不依赖实验室研究，目前未找到任何明确或可复制的生物效应。

youdao