您要查找的是不是：
- An unsaturated polyester resin was synthesized from dicyclopentadiene, maleic acid and ethylene glycol. This resin can be moulded by casting and also can be hardened in air. 用二环戊二烯,顺丁烯二酸和乙二醇合成不饱和聚酯,这种不饱和聚酯既可浇铸,也可以在空气中固化。
- He sucked in air, then went under the water again. 他深深吸了一口气又潜到水里。
- Please harden in the main ropes, the sail's not tight enough! 请把主要的绳索拉紧些，帆扯得不够紧！
- Concrete shrinks in volume as it hardens in air; this phenomenon is called shrinkage. 混凝土在空气中硬化时体积会缩小，这种现象称为混凝土的收缩。
- Designed to operate on land, water, or in air. 长于陆海空作战的，三栖的可在陆上、水上或空中操作的
- Insurance rates have harden in the previous years. 前几年保险费率绷得很紧。
- How much does sound travel faster in water than in air? 声音在水中比在空气中传播快多少？
- The speed of sound in water is about four as great as in air. 声音在水中的速度是空气中的四倍左右
- Exhaust gas has been incriminated in air pollution in cities. 废气已过视为城市空气污染的原因。
- She crawled onto the river bank and lay there gulping in air. 她爬上河岸,躺在那里喘着大气。
- You'd better harden in the main ropes,the sail's not tight enough! 你最好拉紧主要的绳索，帆拉得不够紧！
- What is the percentage of nitrogen in air? 空气中所含的氮的比例是多少?
- He watched the bombs bursting in air. 他看见炸弹在空中爆炸。
- He sucked in air,then went under the water again. 他深深吸了一口气又潜到水里。
- The oxidizing temperature is350℃,3 hr in air. 过氧化则会使薄膜富氧，同样使结构变化，吸收限变宽而向高能方向移动。
- Please harden in the main ropes,the sail's not tight enough! 请把主要的绳索拉紧些，帆扯得不够紧！
- Rinse filters in air conditioners. 冲洗空调的过滤网。
- Sound travels better in water than in air. 声音在水中比在空气中传播得快。
- Casualties in air crashes are terrible. 空难的人员伤亡很可怕。
- Breathe in air the colour of lavender. 你将淡紫色的空气吸入了体内。
