难

Department of Aerospace Biodynamics,The Forth Military Medical University,Xi'an 710032,China

虽然这是一种较好的方法，但载人离心机设备复杂、昂贵，实难普及。

In the literature in China, most of the related work in biochemical engineering are experimental models based on the lab data, which are hard to explain the nonlinear oscillatory phenomena, and most of the work in biomathematics consider the yield functions as constant, linear functions, or some special cases of our general function.

工程界对于连续发酵的非线性振荡方面的研究大多是采用从实验数据归纳出来的经验模型，很难反映过程的本质；生物数学界有关这方面的模型，其中的函数大多数是文的特例。

Bipedalism might feel natural to us, but in fact it's a specialized adaptation that is rather difficult compared to walking on all fours - no wonder most apes and monkeys avoid it. It also explains our prevalent lower back pain.

对我们来说，我们可能感觉两足动物很自然，但是，事实上，两足行走比四足行走难多了，所以，大多数猩猩和猴子避免两足行走也不足为奇，这还解释了我们经常腰疼的原因。

Besides, this birdcage can't be hard to bust out of.

另外， 这种鸟笼也不是那么难挣脱的。

"Besides, this birdcage can't be that hard to bust out of."

"另外，这种鸟笼也不是那么难挣脱的。"

This paper discusses how to discriminate the types of the crystalline phase change using the method of the birefringence.

而在这些检测工作中，最重要的，也是最难的是鉴别晶相的相变类型。

We scored in the second half but Birmingham defended very well and made it difficult for us.

下半场我们进球了，但伯明翰的防守做得很好，我们很难打。

All these things are the beginning of birth pangs.

24：8 这些都是产难的开始。

These things are the beginning of birth pangs.

这些都是产难的开始。

Mt. 24:8 All these things are the beginning of birth pangs.

太二四8 这些都是产难的开始。

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。