energy y level 能级 ; 能态
Y level Y型水平仪
mercury y level 水银水平仪
Battery y level 电池剩余电量
color bar Y level 彩条亮度电平
molecular Y-type energy level system 分子Y型能级系统
temporary y base level 暂时基准面
Four-level inverted Y-type atom 倒转Y型四能级原子系统
N a level mounted on a Y-shaped support that can be rotated 回转水准仪 [surveying]
Y - Youth - using social networking allows you to connect on a deeper level with young people.
Y - Youth(年轻人)使用社交网络能让你与年轻人产生更深入的联系。
So, just to get you used to this idea, I'm going to draw a level surface of a function of three variables OK, so it's a surface given by the equation w of x, y, z equals some constant c.
为了令你们习惯于这个想法，我画一个三变量函数的等值面,这是一个平面,由函数w=c给出的。
Of course, start along the y-axis and then horizontally. That is the same level of difficulty.
当然先沿y轴,然后水平走，难度是相同的。
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