certain简单

developed certain behavioral traits.

如何形成某些行为特征。

Ask people about public libraries and a certain image springs to mind: dusty, old-fashioned, the sort of place you enjoyed as a child but, rather like a British seaside town, would you go there now?

问起公共图书馆，人们脑海中会浮现出某种印象：布满灰尘、过时老旧，是你小时候喜欢去的那种地方——但就像英国的海滨小镇一样，你现在还会去那里吗？

A mixed system means that high-speed trains must travel on the regular tracks on certain routes or when passing through large cities.

混合系统意味着高速列车在某些线路上或经过大城市时必须在普通轨道上行驶。

One of the most important changes the upgrades will bring is the segregation of the high-speed line from the regular one in certain urban centres through the construction of underground rail links.

升级改造将带来的最重要变化之一，是通过修建地下铁路连接线，在某些城市中心将高铁线路与普通线路分开。

boost citation counts for certain authors.

提高某些作者的被引次数。

Certain artifacts are especially vulnerable because some pioneers in plastic art didn’t always know how to mix ingredients properly, says Thea van Oosten, a polymer chemist who, until retiring a few years ago, worked for decades at the Cultural Heritage Agency of the Netherlands.

高分子化学家西娅·范·奥斯滕说，某些手工艺品尤其脆弱，因为一些塑料艺术的先驱者并不总是知道如何恰当地混合原料。她在几年前退休之前，在荷兰文化遗产局工作了几十年。

Far less certain, however, is how successfully experts and bureaucrats can select our peer groups and steer their activities in virtuous directions.

然而，远不能确定的是，专家和官员能在多大程度上成功地为我们挑选同伴群体，并把他们的活动引向正确的方向。

certain.

确定的。