化学变化

In order to determine the right curing technology and improving the quality and usability of burley tobacco, the major physical and chemical changes of burley tobacco during curing were studied from 1999 to 2001 in Enshi, Hubei province.

为进一步明确白肋烟的调制工艺，提高白肋烟质量，1999- 2 0 0 1年在湖北恩施地区进行了调制期间白肋烟主要物理、化学变化的研究。

One appealing theory traces our dependence on it to the chemistry of the late Cambrian seas.

一个富有吸引力的理论认为我们对盐的依赖可从寒武纪海洋的化学变化中得到线索。

This is a chemical change, not a physical one.

这是一个化学变化，而不是物理变化。

A chemical change is one in which the structure of particles is changed and new substance is formed.

化学变化是其内有粒子结构变化和有新的物质生成的一种变化。

In the case of a chemical change, some new substance is produced.

就化学变化而言，它会产生新的物质。

We saw that a chemical change had taken place.

我们看到已发生了化学变化。

When matter is changed to a substance different from what it was , the change is a chemical change .

当物质变成与其原来不一样的另一物质时，这种变化是化学变化。

When matter change to a substance different from what it was, the change is a chemical change.

当物质变成和原来不同的物质时，这种变化是化学变化。

In a chemical change, energy is not created, nor is it destroyed.

在化学变化、能源是不创造，也就是摧毁。

Any chemical change in the mother's blood will affect the child for better or worse.

母亲血液中的任何化学变化都会对胎儿带来好的或坏的影响。

No clear conclusions can be made about the predictie alidity of specific measures, they found, except for criteria for the underuse of drugs for cardioascular disease.

除了心血管病不合理用药标准外，对于特定评价方法的预测效度没有明确的结论。

The third and last is that almost all of them, being infinite in number, have been impostures, and by idle and crafty brains merely contrived and feigned after the event past.

第三、即最后一点是：几乎所有这些不胜枚举的预言都是欺人之谈，都是在事件过后由无聊而狡猾的脑筋推测与凭空捏造的。