The recent work has been made possible by new techniques of molecular biology that allow viral DNA to be detected at low concentrations in the environment.

分子生物学的新技术使最近的工作成为可能，这种新技术能在环境中检测到低浓度的病毒 DNA。

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Whereas some of the low self-control study members are more likely to be single parents with a very low income and the parent is in poor health and likely to be a heavy substance abuser.

然而，一些自我控制能力低的研究对象更有可能是收入非常低的单亲父母，父母的健康状况很差，很可能是重度药物滥用者。

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Mars is too faint and too low in the sky to be observable.

火星太暗，在空中位置太低，所以观测不到。

《柯林斯英汉双解大词典》

The exploration vehicle will be able to measure methane even at very low levels in many places on the surface.

VOA: special.2009.12.30

It says, given a low and a high range, 9 in this case it would be zero to nine.

给它一个下限和一个上限，在这个例子中就是0到。

麻省理工公开课 - 计算机科学及编程导论课程节选

So, in contrast, if it has a low electronegativity, this then is going to be an electron donor.

那么，相反地，如果它的电负性很低，它将会是一个电子的施主。

麻省理工公开课 - 化学原理课程节选

The bulk of jobs growth here will be in low to medium-skilled jobs, Sissons says, putting the technologies gleaned from high-skilled engineering into practice.

FORBES: Green Jobs Are a Cost, Not a Benefit

The region has managed to attract some new jobs to replace the old industrial ones, but they have tended to be in low-wage, low-skill occupations, such as those at the 15 new call-centres in Plymouth.

ECONOMIST: They want to emulate the boom in the rest of the south-west

It is estimated to be in the low 50s, a slump from around 62% in 2007.

BBC: Former Assembly Speaker criticises poll count system