Living life, I'm just a dust, and some things are not of a man can control, some frustrated is impulsive heart is difficult to get rid of!

人生在世我只是一粒微尘，有些事不是人为就能驾驭的了的，有些失意是浮躁的内心很难摆脱掉的！

youdao

Because embryonic stem cells are so immature, it is very difficult to control what kinds of cells they produce, and the fear is that a tooth could grow inside a heart, for instance.

因为胚胎干细胞没有完全成熟，它很难控制他们将来的类型，比如害怕在心脏旁边长一颗牙齿。

youdao

It sounds like an inefficient process which would be difficult to manage and would do little to control the safety and pollution risks that are at the heart of this matter.

这个事件的中心在于解决和控制开采中的安全和污染问题，而这种方法对于解决问题几乎是无效的。

youdao