Vitamins A, B, C and E contained in a range of fruit and vegetables are all crucial for keeping the skin cells healthy.

一系列水果和蔬菜中的维生素A、B、C和E是保持皮肤细胞健康的所有关键。

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The other option is to change the angle, keeping b constant. So, actually, this side stays the same length.

另外一种选择就是保持b恒定，改变角度，因此，实际上，这条边长度保持不变。

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Further more, the increase of B reduced greatly the touching off and keeping discharge voltages during magnetron sputtering coating, which gives another approach to lower voltage magnetron sputtering.

此外，B的增加显著降低了磁控溅射镀膜工艺的着火电压和维持放电电压，为实现低电压磁控溅射提供了另外一种思路。

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B-cells play a critical role in keeping the immune system healthy.

CNN: iReport: 'Billy's Disease' baffles doctors

With back, groin and ankle injuries - plus on one occasion the birth of his daughter - keeping Flintoff out of action, the team now realises they must have a Plan B in his absence.

BBC: Flintoff celebrates a one-day wicket