常用副词或词组有：

about 近于，大约

around 大约

approximately 大约，近似

near 差不多，几乎

nearly 差不多，几乎

or so …左右，大约

in／of the order of …约为，大约

常用动词有：

approximate 接近

approach 接近，靠近

come near 接近，将近

range from ... to... 从…到…左右，在…范围内不等

vary from ... to... 在…范围内变化

The oxygen content of air is about／around／approximately 21%.

科技英语表达常用句型速查空气中氧的含量约为 21％。

The Curie point for iron is of the order of 700℃ .

铁的居里点大约为 700 ℃。

It is only during the past 50 years or so that scientists have learned how to release atomic energy .

大约在过去的 50 年左右时间内，科学家们学会了释放原子能的方法。

The earth's crustal l thickness varies from about three miles beneath the oceans to about 20 miles through the continent .

地球的地壳厚度大约是 3 英里(海洋下)到 20 英里(大陆下)左右。

Every crane has a certain lifting capacity， ranging from a few tons to many hundreds of tons .

每一台起重机均有一定的起重力，从几吨到几百吨。

As adhesive layer thickness approaches 0， the stress also approaches 0 .

随着粘着层厚度接近于零，应力也接近于零。

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