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It is also indicated that decreasing either the apex angle of transmitter or receiver makes the detecting of the weak scattering more difficult while other parameters remain the same.

而增加发射机的发散角则基本不影响接收到的信号功率。在其他参数不变的情况下，增大接收机或者发射机的仰角都减小了接收机的探测到的信号功率。

Apha amylase was difficult to bind with the substrate, ther fore the hydrolysis rate decreased with time.

此外，当酶水解发生到一定程度，淀粉分子链长度变得很短。alpha淀粉酶与酶作用物的结合较难，因此水解速率随着反应的进行时间下降。

It was difficult for the aphid to take off at 8℃ and the flight time was shortened significantly.

在温度18℃时，麦长管蚜的平均飞行时间、飞行距离最大分别为3.101 h、3.676 km。

By now you've seen how difficult it is to try to analyze and systematize the content of apocalyptic writing.

提要 到目前为止，你可以看到要去分析和整理启示性作品是有多困难。

Some patients'oral anatomy is not good, and bring difficult to repair.Before the repair,doctors shoule examine the patients'oral circumstance detailly,do away with the apophysis ,torus and hyperplasia gingival, make the good preparation work.

一些患者口腔解剖条件不好，给修复带来了极大困难，在修复之前要详细检查口腔情况，将骨突、骨刺以及较大的骨隆突手术去除，将增生的牙龈组织切除，作好准备工作。

It is certainly not analytic; and it is difficult to see how as a synthetic claim there can be any corresponding fact in the world that empirically verifies or refutes it even aposteriori.

它肯定不是分析的；也难以明白，作为综合主张，如何能在世界中存在相应的事实从aposteriori『后天』经验上证实或拒绝它。

Some of the Appalachian Trail is easy. Some parts of it are extremely difficult.

阿巴拉契亚小路有些地方很好走，而有些路段则很有挑战性。

It is very difficult for the most powerful of us to appear on the mortal plane.

我们中最有力量的要想在人间现身实在是太难了。

This has led to limited success, in part, because measurement of appetitive sensations is difficult but, more fundamentally, because the association between appetite and food choice or intake is not robust.

这种尝试没有获得多大成功，部分原因是因为衡量食欲感觉有困难，但更根本的原因是食欲与食物的选择或摄取之间的关系并不明显。

I remember that when I was in the countryside,my family had an apple tree,far away from my home but very close to another family.It was very difficult for us to protect this apple tree.

记得我在农村的时候，我们家有一棵苹果树，这棵苹果树离我们家比较远，离另一家人比较近，我们很难保护这棵苹果树。

The dissecting of samples in group2 were difficult. The root of pulmonary artery and ascending aorta failed to be unfolded because fibrous tissue was tough, right and left fibrous trigone were too firm to be solved by hand. Cardiac muscle fibers couldn't be stripped along myofibrillar trajectory since they were prone to break because of their friability.

组2的心脏解剖困难，表现为纤维组织坚韧，游离肺动脉非常困难；徒手无法松解左、右纤维三角，肺动脉和主动脉根部的游离非常困难；心肌纤维坚硬、质脆，解剖时容易断离成碎块，无法沿纤维走行方向剥离。

We have battled against the odds in a province that has become increasingly violent.

我们对在一个争夺日益激烈省的可能性。