某事

Have no difficulty/trouble doing sth.

没有困难做某事

D have trouble in doing sth.

是"费力做某事"的意思。

Have difficulty/trouble doing sth.

"有困难做某事"。

Have none of the trouble of doing sth.

意为不像做某事那样麻烦。

Have some trouble doing sth.

有困难做某事

Have no trouble doing sth.

做某事没问题。

Have some trouble doing sth .

在做某事方面有困难

Have no/some trouble doing sth.

做某事没有/有些困难

Have trouble/difficult doing sth.

做某事有困难。

Have trouble/ difficulty doing sth.

在做某事方面有困难

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。