到目前为止，就像三里岛一样，由于各种因素，福岛电厂散发到外部环境中的放射性物质已经相对的被限制住。

Thus far, at Fukushima, as at Three Mile Island, the releases of radioactivity to the environment have been relatively limited, but for different reasons.

youdao

所以他说基因不像其他外部因素那样重要，这里他指基因因素不会严格限制我们的寿命。

So as well as saying that genetic factors aren't as important as external factors, here he's saying that genetic factors also don't keep to a strict timetable.

youdao

对外部因素影响的认识不足，使得减压井的布置僵化，在一定程度上限制了减压井的作用效果。

Not enough understanding towards the influence of external factors leads to a rigidly conventional pattern on arrangement of relief Wells, which greatly limits the effect of relief Wells.

youdao