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With the development of science and technology, sensitive, rapid, reproducible, simple and accurate analytical methods are required for the determination of trace elements in geological, biological and environmental samples. The direct determination of extremely low concentration of trace element with modern atomic spectroscopic method, such as atomic absorption spectrometry is so difficult. On one hand, the limitations are associated not only with the insufficient sensitivity of these techniques but also with matrix interference.

随着科学技术技术的发展，在进行地质、环境、生物等样品中痕量金属元素的测定时，常常要求达到ppb级的水平，虽然火焰原子吸收分光光度法具有很高的灵敏度，但是要直接测定这些样品中的痕量组分却很难，这是因为，一方面，样品本身的物理化学状态有的不适合直接测定，或组分的含量低于分析方法的灵敏度；另一方面是存在基体干扰。

There are several ways to reduce the number of atoms required.

有几种方法的人数减少所需的原子。

However,at least in the typical Japanese style,it is not required to attach a thank-you note or card to the gilf.

但是，至少传统日本礼节，礼物不会附带感谢卡片之类的东西。

However,at least in the typical Japanese style,it is not required to attach a thank-you note or card to the gift.

然而按照典型的日本风格，人们不会随礼物附上一个感谢短信或卡片。

In London last year, 127 children required hospital treatment following a dog attack, as against 58 four years earlier.

在伦敦，去年， 127名儿童所需的住院治疗后，狗的攻击，作为对58 4年前。

These festivals also implied the moral attainments and codes of conduct required of women in ancient China.

在这类节日中，亦包涵了古代中国对女性的道德修养和行为修养的要

Everybody is required to attend it on time.

每个人都必须按时参加。

This is the only part of the programme for which attendance is required.

这是对 ，出席会议是必要的方案的一部分。

The value of required attendance is being questioned by more and more teachers and students.

所需的价值提出质疑出席正在为越来越多的教师和学生。

This is a required attribute, and cannot be left out.

这是一个必须的属性，不能遗漏。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。