It occurs when your perceived skill level and the challenge at hand are equal, and you are as in control of your mind and body as you can be.

当你所感知到技能水平和所面临挑战相等时，就会产生心流，你就会尽可能地控制自己思想和身体。

Since no one burns the same exact number of calories that they eat every day, the key is to maintain energy balance over the long term.

因为没有人每天卡路摄入与消耗恰好相等，所以关键是要长远地保持能量平衡。

We don't file all the days of our life in some part of our brain intact and in equal amounts.

我们不会把我们生活中所有日子都完整地记在大脑某个部位，并且数量相等。

Now to be clear, the result is obviously false, just in the diagram I've drawn you can  visually see that these lengths are not equal to each other.

现在要明确一点， 个结果显然是错误，仅从我画图中你就可以直观地些长度是不相等。

So being open-minded about ghosts, we might start with equal odds of them existing or not and so the data is pretty convincing that ghosts exist.

所以对于鬼魂持开放态度话， 我们可能会从它们存在和不存在概率相等开始，因此数据相当有说服力地表明鬼魂是存在。

The rent and profit of barley land, besides, must always be nearly equal to those of other equally fertile and equally well cultivated land.

此外，大麦地地租和利润，必须始终与其他同样肥沃和同样耕种土地地租和利润几乎相等。

For it can easily be shown that the assumption of arithmetically equal probabilities based on a state of ignorance leads to absurdities.

因为可以很容易地证明，基于无知状态算术上相等概率假设会导致荒谬。

We can apply an equal and opposite force to the charged particle and move it across the capacitor as slowly as we like, so that the kinetic energy of the particle is negligible.

我们可以对带电物体施加相等且相反力 并且如此缓慢地移动它通过电容器，以至于我们忽略了粒子动能。

" The consolations of religion are fully equal to its terrors" , Dick Edgeworth reflected as he stumbled out again.

“宗教安慰与它恐怖完全相等”，迪克·埃奇沃思再次跌跌撞撞地走去时样想。