And that controversy leads to another one. Does Darwinian selection take place at the level only of individuals, or of groups as well?
争论最后集中到这样一个问题上，达尔文的物竞天择究竟是只发生在个体层面上，还是在群体层面上依旧有效。
The concept relies on the fact that the ear not only senses sound but also makes noises of its own, albeit at a level only detectable by supersensitive microphones.
这一设想的依据是：人耳不仅只是感知声音，它自己也同时在发出声音，即使其强度只有超灵敏拾音器才能侦测到。
In its first 25 years, ASEAN leaders had met at Summit level only 4 times!
在东盟成立后的前面25年时间里，东盟领导人峰会级别的会议仅仅有4次。
In the case of valeric acid, for example, that concentration was seven parts per trillion-a level only just detectable by bloodhounds.
比如，缬草酸的汗臭味浓度为万亿分之七，这种浓度只有警犬才能发觉。
Does Darwinian selection take place at the level only of individuals, or of groups as well?
达尔文选择是只发生在个体水平上，还是整体水平上呢？
In Japan, the phenomenon started earlier, in the 1980s, but has remained at a modest level: only five or six percent of marriages in the mid-2000s involved foreign wives.
在日本，这一现象出现于更早的80年代，但外国媳妇这一群体的数量一直没有大的增长：21世纪初期中叶，日本“洋媳妇”的比例仅为5%至6%。
This new feature improves debugging, eliminating the need to trace people assignment errors down to the directory level, only to find that the chosen assignment criteria is not supported.
此新功能改进了调试，不再需要将人员分配错误一直追溯到目录级别，结果却发现所选的分配条件不受支持。
You cannot remove the default groups at the collection-level, only custom groups.
您无法在集合层级移除预设群组，只能移除自订群组。
You cannot remove the default groups at the collection-level, only custom groups.
您无法在集合层级移除预设群组，只能移除自订群组。
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