表面活性；
The results show that the BDSA salts have high surface activity.
结果表明BDSA盐具有较高的表面活性。
High surface activity and good emulsifying action of such surfactants are found.
这类表面活性剂具有较低的表面张力和相当好的乳化性能。
Others show extreme close-ups of activity on the Sun’s surface.
其它一些图片则给太阳表面的极端活动做了特写。
On the surface, it might appear as if this is a difficult or esoteric activity.
表面看来，这似乎是一个很困难或者机密的活动。
Usually there's free activity on the surface of metal because of electronic.
通常金属的表面由于电子可以自由的活动。
Water Resistant 200 m Suitable for professional Marine activity and serious surface water sports.
防水200米-适合专业海洋活动和严重的水上运动。
Water skiing is a surface water sport and recreational activity.
水上滑板是一种水面上的体育运动也是一种消遣娱乐的活动。
Water skiing is a surface water sport and recreational activity.
水上滑板是一种水面上的体育运动也是一种消遣娱乐的活动。
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