Therefore, a level of 70 per cent of initial light level could be considered a threshold of useful life for general lighting.
因此，初始亮度的70%可以被当做普通照明有用时间的一个门槛。
2
Investors are also pushing to add or raise hurdles, which require that general partners reach a certain threshold of returns before they start earning profits themselves.
投资者也极力增加障碍，要求普通合伙人在开始获得自身利润前必须达到特定的回报。
3
In general, any job is better than no job, but it is true that some jobs are dangerous, distressing, or fail to put workers above the poverty threshold.