二次幂：在代数中，一个数的平方是此数与它的本身相乘所得的乘积，一个元素的平方是此元素与它的本身相乘所得的乘积，记作x²。平方也可视为求指数为2的幂的值。若x是正实数，这个乘积相当于一个边长为x的正方形的面积；如果x为虚数，则这个乘积为负数。如果x为非虚数的复数，则这个乘积也是复数。
the product of two equal terms
同义词： square
二次幂
平方
二次幂
A lot of their work comes down to measurement—everything from the exact angle of a swimmer's dive to the second-by-second power output of a cyclist.
他们的许多工作都归结于测量——从游泳运动员跳水的准确角度，到自行车运动员每秒的动力输出。
A second power shift is likely to be from the European Commission to national leaders.
第二个权利转换可能是从欧盟委员会向各国领导人身上转移。
In either case the internal friction is found to be proportional to the first and second power of (1-s), where is the degree of long range order.
在这两种情况中，内耗都是正比于(1 - S)的一次幂或二次幂的，这里s是长程有序程度。
But it was not until eighteen fifteen and the Second Barbary War that the power of the Barbary pirates was broken.
VOA : special.2009.05.27
Something raised to the second power has got to be positive.
二次方的东西,也一定是正数。
固态化学导论课程节选 : 麻省理工公开课
Here, divine force reduces to brute power as it does in "The Magi" and "The Second Coming."
这儿，圣之力变成了兽之力,《东方三贤》和《第二次降临》
现代诗歌课程节选 : 耶鲁公开课
Second,it attracts attention and shows the groups have the ability to attack a major power station.
VOA : standard.2010.07.21
The Union of the Gabonese People candidate finished second to Omar Bongo in 1998 and 2005, and says Gabon can not accept power passing "dynastically" from father to son.
VOA : standard.2009.08.30
The Devils' second power play was more productive, and a little bit luckier at 15:15.
Moulson brought the Islanders within 5-4 by netting his second power-play goal of the game with 8:28 left.
Giroux made Buffalo pay when he scored only 17 seconds into the third for Philadelphia's second power-play goal and a 3-1 lead.