现在在MBA的键盘上弹出键变小了，紧靠它的右边是黑色的电源键——圆形的铝制电源按钮不复存在。
A black power key now sits immediately to the right of a smaller eject key on the MBA's keyboard — the round aluminum power button is gone.
s和1s上两个电子组成的键合电子成椭圆形,这是成键，这是反键电子，这些是刚刚已经画过的能级,我也给你们画了。
s plus 1s gives you this oval ellipsoid which is the bonding, and here are the antibonding, and then these are the energy levels that I have been drawing for you.
捕获整个页面或者任何部分，用矩形、圆形、箭头和线条、文本等等进行注释，然后一键即可进行分享。
Capture the whole page or any portion, annotate it with rectangles, circles, arrows, lines and text, one-click upload to share.
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