These subjects are not always easy to study.

这些领域并不总是容易研究的。

youdao

It's Model Biological Systems 101: study an animal that's easy to study, and then extrapolate.

这就像生物系统模型101：先研究一种容易研究的动物，然后再以此作出推断。

youdao

Before going abroad, I thought it would be easy to study English with an English-speaking environment.

出国以前我以为到了国外，有了英语环境，自己会不费力地通过语言关。

youdao

"When asteroids come this close, it's very important to try to learn about them - it's become so bright, so it's so easy to study, " he told BBC News.

BBC: Asteroid 2012 DA14 in record-breaking Earth pass

That helps to make them easy to study.

ECONOMIST: Emotion is essential to human survival

That means it is easy to study.

ECONOMIST: Truly selfish genes