此消彼长的英文：
wane and wax, or increase and decrease.
When one is rising, the other is falling.

wane是什么意思：
n. 衰退；衰退期；月亏期
v. 衰落；退潮；消逝；亏缺

Why should the moon have wax and wane?
为什么一定会月有阴晴圆缺？

The moon waxes and wanes every month.
月亮每个月都有盈亏。

And his marvelous sun was waning apparently to a black eclipse.
而他的光辉夺目的太阳明明是在黑暗的晦蚀中消损。

wax是什么意思：
n. 蜡，蜡状物；耳垢
v. 增大，月亮渐满；给…上蜡
adj. 蜡制的

The moon is waxing.
月亮越来越圆。

These comprise asphalt, tar and waxes.
其中包括沥青，焦油和蜡。

An axe for wax will not cut rock.
砍蜡的斧子砍不了石。

increase是什么意思：
v. 增加，增大
n. 增加，增长

Crime is on the increase.
犯罪事件正在增加。

An increase in the energy of the electrons increases the probability of ionization
增加电子能量，会增加电离几率。

The fibre diameter increases with increasing fluidity of the molten oxide
熔融氧化物的流化度增大，纤维直径增大。