很难的

This is a very difficult academic topic.

因为这是一个很难的学术课题。

Any integer multiple of an infinitesimal is still infinitely small, i.e., infinitesimals do not satisfy the Archimedean property .

这种做法失宠于19世纪，因为这是很难的概念微不足道精确。

If you ask me, I think it's difficult.

如果你问我，我想那是很难的。

Swam: Now that we're here, it's kind of awkward to go in.

swam：现在我们已经在这里了，虽然进去是一件很难的事情。

Yet why there shuoule be nothing is hard to say.

可是，要说清楚为何什么都不该存在是很难的。

It is really hard to be on good terms with everyone.

Ss： 要和每一个人搞好关系是很难的。

"IT'S tough to make predictions, especially about the future," said that great baseball-playing philosopher, Yogi Berra.

棒球运动员尤吉·贝拉有句哲言："预测是件很难的事情，尤其是预测未来。"

A:I don't know many big words,you see.

你要知道，很难的单

Finally, she made a difficult decision:to send him to a boy's boarding school.

最后，她做了一个很难的决定：送他去一个男孩寄宿学校。

We can get aerial approval procedures for you as soon as possible by using our unique resource. We could provide you helicopters with the cheapest prices and the best performance, with a selection of helicopters from about 20 types helicopter models of civil aviation and avion. We can also do a lot of things that other companies can not do, such as aerial shooting of Shanghai Pudong Lujiazui, Beijing Bird's Nest, Yunnan Lijiang, Tibet Lhasa, and other areas that is difficult to get approval procedures.

另外用我们的人脉关系快速为你办理航拍批文，从军队或者民航大约20种直升机型号中挑选价格最合适、性能最理想的直升机，为你提供最好的航拍服务，我们还可以做很多公司很难办到的事情，如航拍上海浦东陆家嘴、北京鸟巢、云南丽江、西藏拉萨等审批手续很难的地区。

I can not make it blossom and suits me

我不能让树为我开花

When temperatures are above approximately 80 °C discolouration of the raceways or rolling elements is a frequent feature.

当温度高于 80 °C 左右时，滚道或滚动元件褪色是很常见的特征。