Some students are exempt from certain exams.

有的学生可免除某些考试。

《牛津词典》

Some soils are actually too alkaline for certain plant life.

有些土壤的碱性，实际上对某些植物的生长是过高的。

《柯林斯英汉双解大词典》

Some doctors advise setting aside a certain hour each day for worry.

一些医生建议每天抽出一定时间思忧。

《柯林斯英汉双解大词典》

Some states only permit use for certain diseases like cancer, multiple sclerosis or AIDS.

VOA: special.2010.10.11

He found that some droplets had a certain velocity, and then others had a velocity plus some step.

他发现了一些液滴存在某个速度，还有其他的液滴有速度和位移。

麻省理工公开课 - 固态化学导论课程节选

You look at certain things and you overly -you pay too much attention to some things and too little to others.

当你在观察一些特定的事物时,你会投入过多精力,而在其他方面投入精力不足

耶鲁公开课 - 金融市场课程节选

Many journalists on the staff of 450 sobbed when informed of the sale, certain some would lose their jobs for openly confronting the government.

NPR: Last Anti-Chavez TV Station To Be Sold

"I'm really certain that some species are going over the edge, are disappearing, " Hedges said.

NPR: Alarm Over Vanishing Frogs In The Caribbean

There are certain things some kids can't do on a given day because it's too hard.

CNN: Recovery high school a 'soft landing' for post-rehab teens