过去的遮阳篷主要是棉质的或帆布质的，所以经不起室外环境等因素的影响，没有经久耐用的特性。
In the past, the awning was mainly made of cotton or canvas, so it could not stand the influence of outdoor environment and other factors.
随着计算机网络等信息技术参与到课堂教学过程中，整个教学环境发生了质的变化，这种变化必然带来对教师的新的要求。
With the computer and network applying in the classroom, the whole instruction circumstances change greatly and expound the new requirements to teachers.
在对湖泊或水库等浅层水域的环境变化研究和环境污染检测中，浅层水域的淤泥质沉积物取样是一项必不可缺的工作。
It is very essential in the study of environmental change and pollution monitoring to sample the undisturbed sediment from shallow water areas, such as lakes and reservoirs.
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