The weather alternates between sunshine and rain.

时而天晴, 时而下雨。

He's sort of poking the pigs and checking the flocks and herds.

他时而戳戳猪 时而安抚牛羊。

Horses declined to a single species, which appears so sporadically in the fossil record as to suggest that for a time it teetered on the brink of oblivion.

马只剩下一个物种，时而出现在化石记录中，表明它一度到了灭绝的边缘。

Every now and then I remember to choose my outfit the night before , but usually I do it in the morning.

时而我记得该再前天晚上选好衣服，但是我经常在早晨做些。

At times charged, at times languid.

时而冲锋陷阵，时而萎靡不振。

It's normal to feel sad from time to time, but if you're sad or numb most of the time even while participating in fun activities, you may be suffering from high functioning depression.

时而难过是正常的，但是如果你老是难过，即便是在有趣的活动中也是如此，那你可能患有高功能抑郁症。

Constant volcanic and earthquake action occurs here, sometimes with cataclysmic results.

地区频繁的火山活动及地震时而造惨重的后果。

Silence fell between them again, the most uncomfortable silence Harry had ever experienced with Dumbledore; it seemed to go on and on, punctuated only by the little grunting snores of the portrait of Armando Dippet over Dumbledore's head.

两默了，是哈利在邓？布利多身边经历过的最难堪的默。它似乎无休无止，只是时而被邓布利多头顶上阿芒多·迪佩特哼哼哧哧的鼾声打断。

But the stars which seemed to move over the vault of heaven, now, say, towards the Great Bear, and now towards the Scales, were the ones that interested them most.

但是他们最感兴趣的是那些在天穹中移动并时而在“大熊星座”，附近时而在“天秤星座”近旁的星星。

Alternately self-effacing and grandiloquent, he talked about the books he was reading and what worried him about the law, the country and the world.

他聊起最近在读的书，以及对法律、国家乃至全世界的担忧，时而谦逊，时而豪言壮语。

Sometimes I looked out of the window at the grey November afternoon, and saw the rain pouring down on the leafless garden.

时而望望窗外。11月的午后天气阴，大雨倾泻在秃枝枯叶的花园里。

Everything must be done in its own time.

每件事都必须应时而做！

He hums to himself, he growls out tunes, he waves his arms.

他时而哼哼呀呀自言自语，时而大声咆哮高歌，奋力地挥舞着臂膀。

If something waxed and waned, it grew stronger then weaker over time.

“wax and wane”，形容某事随着时间的推移，时而变强，时而变弱。

I get up at ten o'clock now and then.

我时而在十点起床。

Just as the Danube's waters have coursed through Budapest, so too have the great tides of European history, often gracefully, but sometimes with ferocious force.

有如多瑙河河水流过片土地一样，欧洲的历史洪流也一样涌到此境，时而优雅，时而狂暴。

But in the meantime, we try to live in harmony with our sometimes turbulent planet.

但与此同时，我们试图与我们个时而动荡不安的星球和谐相处。

She could hear grief coming out of the ground, crying and screaming.

她听到了片土地上传来的悲鸣，时而呜咽、时而尖叫。

By turns philosophical and polemical, this is a provocative and fascinating book.

时而富有哲理，时而充满争议，是一本发深省且引入胜的书。

Outside in the street, huge crowds were already gathering, joking and laughing, and pushing to get the best places near the great black platform, where the rope hung ready for its morning's work.

外面的大街上已聚集了拥挤的群，他们时而说着玩笑话，时而放声大笑，挤来挤去，都想找到离黑色平台最近的地方。在那儿，绞索已经挂起来，为当天早上的工作准备好了。