It's in the bloodstream—the urge to mingle genetic strains without plan.

它存在于血液中——没有计划地混合遗传菌株的冲动。

It was enough that she was with him and he was holding her hands and smiling, completely friendly, without strain or fever.

既然她跟他在一起，他在拉住她的手微笑着，即便纯粹的朋友式的，没有了什么**，那也就满足了。

Mr. Underwood singled me out, probably because I'm the lightest kid in the class, and he could toss me around without straining himself.

安德伍德先生还是把我挑了出来，大概是因为我是班里最轻的男生，他可以毫不费力地就把我颠来倒去。

If you don't succeed at first, rest a little and begin afresh. And press forward, but quietly without fagging yourself, without straining your mind.

做不出的时候，暂时休息一下再做，要一一地做，但是不要心急！勉强是不好的，不要过于拼命！

This twinning allows for a particular kind of deformation, termed 'pseudo-elasticity', where the material can undergo considerable strain without suffering any permanent damage.

这种孪生允许一种特殊的变形，称为“伪弹性”，材料可以承受相当大的应变而不会遭受任何永久性损坏。

Her heart of compressed ash, which had resisted the most telling blows of daily reality without strain, fell apart with the first waves of nostalgia.

她那颗灰烬般的心，曾毫不费力地抵抗着日常现实最有力的打击，随着第一波怀旧之情而分崩离析。

The remark concerning, I believe, settling for less for a while at the gallery while looking for another position, so that the house could be purchased without strain.

我相信那番话是关于，在寻找另一个工作的时候，先得过且过地待在画廊一段时间，这样买房子才不会吃力。

A note here. If Ruburt would resume his back exercises his sinuses will improve. The exercises should be done very slowly, however, and without strain. At times he did them too quickly.

这里有一点说明。如果鲁柏能恢复他的背部运动，他的鼻窦会得到改善。不过，这些运动应该慢慢地做，没有压力。有时候他做得太快了。

They can canter effortlessly at 40 km an hour,   gallop without straining at 70 km an hour, and can reach top speeds of up to 100 km an  hour.

它们可以以每小时 40 公里的速度毫不费力地慢跑，以每小时 70 公里的速度疾驰而不用力，最高时速可达 100 公里。

It appears spontaneously when we're completely immersed in the present moment, consumed by what is, without the need for anything to change, without straining ourselves to be anywhere but in the here and now.

当我们完全沉浸在当下，不需要任何改变，不需要强迫自己去除了此时此地以外的任何地方，这种满足会自然地出现。