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1·The composition and levels of air pollution vary from place to place.

空气污染的成分和程度在各个地方都不尽相同。

2·Engine noise is the major noise source of automobile; air power noise is one of composition parts of engine noise.

发动机噪声是汽车的主要噪声源，空气动力噪声是发动机噪声的组成部分之一。

3·Plato's Timaeus conjectures on the composition of the four elements which the ancient Greeks thought made up the universe: earth, water, air, and fire.

柏拉图的《提马亚斯》推测古希腊人认为宇宙由四种元素组成：地，水，风，火。

4·The effects of the feed rate of air, steam and coal on bed temperature, gas composition, calorific value, carbon conversion and gasification efficiency are predicted and analyzed with the model.

在此基础上，还就空气加入量、蒸汽加入量及加煤速率对床温、煤气组成、煤气热值、碳转化率和气化效率的影响做了预测和分析。

5·This paper presents operation, structural composition and design method of air - cushion floating devices, as well as application in hoisting and conveying machinery.

概述气垫悬浮技术和装置的主要工作原理、结构组成、设计要点及其在起重运输机械方面的应用。

6·Objective: To evaluate the influence of air oxidation, anodizing and tin coating sample on elemental composition and thickness of surface film of cast pure titanium.

目的：评价大气热氧化、阳极氧化和氮化钛镀膜对铸造纯钛表面膜组成和厚度的影响。

7·The composition of main air blower set of catalytic cracking unit. The different types of blower and its different inlet pipe system arrangement were recommended.

介绍了催化裂化装置中主风机机组的组成，以及不同型式的鼓风机其入口管系的不同配置。

8·Our life is by air, water and AD composition.

我们的生活是由空气、水和广告构成的。

9·A system composition and design consideration of a pressurized room is present in this article and it is emphasized two parts: pressurized control system and air duct system for this room.

文章介绍了正压房间的系统组成及设计，着重阐述了正压控制系统和风道系统两部分的设计。

10·Although PM2.5 is only a few components content of earths atmospheric composition, but it has important effect on visibility and air quality etc.

虽然PM 2.5只是地球大气成分中含量很少的组分，但它对空气质量和能见度等有重要的影响。