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That is encouraging for palladium-catalyzed allylic substitution reactions which is difficult to use in industry due to the current low reactivity of catalysts.

而且，值得注意的是这类配体的反应活性都非常高，对于由于催化剂活性低难以在工业上应用的钯催化烯丙基取代反应来说，这无疑是一大喜讯。

Yu rang determination to remain unchanged, he said:"I do it is very difficult to make, and why do you want those who are masters of ambidexter person feel ashamed!"

豫让决心不变，他说："我做的事是很难办成的，之所以这样是想让那些对主人怀有二心的人感到惭愧！"

In fact, the calculation of income used to be an ambiguous concept, difficult to achieve precision.

事实上，收入的计算是用一种模棱两可的概念，难以实现的精度。

It is very difficult to treat the AMI patients owing to the restriction of technology and equipment.

在治疗急性肠系膜血管缺血疾病病人的治疗中，在许多医院因设备和技术等条件的限制，处理十分困难。

However, it is difficult to strip Fe from the loaded extractant, this will cause trouble to the U stripping with 50 g/L ammonium carbonate or sodium carbonate.

另外，由于负载的铁不能完全反萃，会给后续的碳酸铵反萃U带来麻烦。

My physics teacher often use analogies to illustrate a number Of difficult to understand the concept.

我的物理老师经常使用类比来说明一些较难理解的概念。

It is difficult to build an analytic expression that includes all the factors to describe the heat flow in electrical apparatus.

电器各部分的发热与散热是一个非常复杂的过程，影响它的因素很多，很难建立一个考虑到所有影响因素的热过程解析公式。

The characteristics are the production is easy to operate, it is difficult to separate the consolidated plate and anchor embolus when the anchor is consolidated, and the production of cold bridges and hot bridges is reduced and so on.

其特点易于操作，不容易在锚固时固定盘与锚栓脱离，降低冷桥、热桥的产生等。

The characteristics are the production is easy to operate, it is difficult to separate the consolidated plate and anchor embolus when the anchor is consolidated, and the stable ability of anchor is strong and so on.

本产品采用德国技术，进口原料，精工制作而成，广泛用于膨胀聚苯板薄抹灰外墙外保温体系，。其特点易于操作，不容易在锚固时固定盘与锚栓脱离，锚固力强等。

A new study published in the journal of the American Dental Association suggests that a genetic variation may make redheads more difficult to anesthetize and as a result they tend to avoid the dentist more than blond, brown or black haired people.

美国牙科协会杂志》中发表的一项最新调查研究认为，由于人类基因多样性可能导致红发人更难被麻醉，所以和金发、棕发或黑发人相比，他们更不愿意去看牙医。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。