不仅如此，这些持续时间长久的物质在被弃用数年后仍然存在。
Still, they are long-lasting chemicals that remain in the environment for years after they are out of use.
在2005年双方停止战斗时，我们应该发现这次非洲持续时间最长久的内战牺牲了250万人民的生命，另有好几百万人民流离失所。
By the time the fighting stopped in 2005, Africa's longest civil war had cost 2.5m lives and displaced many millions more.
紫锥菊的疗效参差不齐，这种植物长久以来被人认为有助于缩短感冒持续时间。
Evidence has been mixed on echinacea, a purple flowering plant long thought to help shorten the duration of colds.
这种关系持续时间长久、紧密，成员之间相互保护对方。
一些持续时间最长久的殖民影响，可以在那些曾经受过殖民的健康的土著人中被发现。
Some of the longest-lasting effects of colonization can be found in the health of the native people who were colonized.
然而，研究口吃的科学家们给出了一个更为谨慎的结论：这些效果固然真实，但持续时间不够长久。
Scientists who study stuttering sound a more cautious note: such effects, while real, have shown a tendency to be short-term.
然而，研究口吃的科学家们给出了一个更为谨慎的结论：这些效果固然真实，但持续时间不够长久。
Scientists who study stuttering sound a more cautious note: such effects, while real, have shown a tendency to be short-term.
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