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。
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。
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。
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