He told Reuters that pollutants are present at harmful levels in the area.

他在接受路透社采访时表示，该区域污染物的水平已经达到了有害的程度。

Occasionally, though, features are present at birth, called early-onset or neonatal Marfan syndrome.

有时，这些症状也可在出生时就表现出来，我们称之为“早发性马方综合征”或“新生儿马方综合征”。

The researchers are presenting ShareKey in March at the CeBIT trade fair in Germany.

研究人员在德国国际信息及通信技术博览会上展示了这一款应用。

These substances are present at incredibly low concentrations — typically just parts per billion, much lower than ethanol concentrations in the breath.

这些物质以极低的浓度存在——通常仅为十亿分之几，远低于呼吸中的乙醇浓度。

And we know that this happened in the morning around a shift change, when overnight and daytime workers are present at the site.

我们知道这起枪击案发生在早上员工换班的时间，晚班工作人员和白班工作人员当时都在现场。

The awards are presented at a live televised ceremony, most commonly in February or March and six weeks after the announcement of the nominees.

奥斯卡颁奖典礼会通过电视直播， 通常在每年的二月份或三月份举行，即在各项获奖提名宣布的6周之后。

The U.S. Food and Drug Administration, or FDA, reported recently that the chemicals are present at much higher levels than current government health rules permit.

美国食品和药物管理局(FDA)最近报告说，这些化学物质的含量远远高于现行政府卫生规定的水平。

One, this is not a historically high level of interceptions at the southern border, and, in fact, people are presenting themselves at checkpoints.

第一，这不是南部边境历史上最高水平的拦截，事实上，人们正在检查站出现。

Ewine says based on her research, water and the other ingredients you need to form life are present at the formation of nearly all new planets.

Hall：Ewine 说，根据她的研究，水和形成生命所需的其他成分在几乎所有新行星的形成过程中都存在。

135.Before you are present at debate, remember to shine the pair of shoes and put on the tidy trousers and never forget to wear a tie that matches your shirt.

在你出席辩论赛之前，记得要擦亮你的鞋子，穿好整洁的裤子。还有别忘了戴好能搭配你衬衫的领带。