If two flying insect populations took up residence in separate nearby valleys, chances are that individuals from each population would fly back and forth, continuing gene flow.
如果有两个飞行昆虫种群居住在相距不远的不同山谷中，那么任一种群中的个体都有可能来回飞行，从而使基因流动继续。
Drive to the airport and fly back to Shanghai.
开车到机场，然后乘飞机回上海。
She hasn't decided whether she will fly back to China because of the COVID-19.
因为新冠疫情，她还没有决定是否会飞回中国。
I'm due to fly back to the States on Friday.
我预定星期五乘机回美国。
Then, I will fly back to Canada via Beijing.
然后，我将经由北京飞回加拿大。
许多鸟飞回来了。
Birds sing happily in the trees and swallows fly back.
鸟儿在树上欢歌，燕子飞回来了。
He had to fly back to Russia to get a visa and he is coming back tonight.
他必须飞回俄罗斯去拿到签证，他今晚将回来。
You could rent a car, drive from the east coast to the west and then fly back.
你可以租一辆车，从东海岸往西海岸开，然后坐飞机回来。
"I'm eager to fly back and help rebuild Haiti," he told TIME shortly after the quake.
“我急切地希望飞回去帮助重建海地。”地震发生后不久，他对《时代》杂志的记者这样说。
After a reception at the Sizzlin Steakhouse, we drove to the airport to fly back to Washington.
在西兹林牛排馆招待了来宾以后，我们坐车去机场，飞回华盛顿。
The young leaves grow on the branches. The swallows fly back home with the greeting of spring.
嫩芽在枝头开始生长。燕子重新回到了自己的家，带来了春的问候。
When it was all over and the birds started to fly back to their camp, Bat silently joined them.
当一切都结束了，鸟儿开始飞回自己的阵营，蝙蝠静静地加入了他们。
I am a business man working overseas. To take the citizenship test, I need to fly back to Canada.
加拿大公民考试是一项必须通过的测试， 若你不能及格，你的公民申请将会被延误或拒绝。
I plan to fly back after our game in Rome and watch that first Champions League game at the Emirates.
我打算在罗马打完我们比赛后飞回来，第一次去埃米尔球场看欧冠比赛。
Even after entering NBA, every summer, Nowitzki would fly back to hometown to train himself with Holger.
即使登陆了NBA，诺维茨基每年夏天都会飞回家乡和霍尔格一同训练。
He'll fly back ahead of the Champions League tie but Wenger has yet to decide whether he'll play a part.
他会在冠军联赛的比赛之前归队，但是温格还没有决定他是否会上场。
Then they were gone. I'm told they were taken to their cars and may have been going to fly back to Canada.
然后他们就离开了。我听说他们都上了车，也许是准备飞回加拿大。
‘With the Transition, I can fly somewhere and if the weather isn’t good enough to fly back, I can just drive home.
有了它，我就可以飞到想去的地方，而且一旦天气不好时，我还可以开回家。
She can't afford to fly herself and her son north, and her two grown children can't afford to fly back to Florida.
她负担不起自己和儿子飞到北边，而她两个成年子女也没法负担飞回佛罗里达州的费用。
Sometimes, however, the angel can't help watching the sky out of the window. He is eager to fly back to heaven.
可是有些时候，天使常常在窗前仰望天空，他渴望能够再次飞回天堂。
In winter, many birds fly to the south, because they need to find a warm place to live, but they will fly back in spring.
冬天，很多鸟儿会往南飞，他们需要给自己找个温暖的地方生存，但是到了春天，它们又会飞回来。
After an initial delay he was cleared to enter the country. He chose voluntarily to fly back but will return when necessary.
在最初的耽搁之后他被获准入境，他主动选择飞回国但在需要的时候他依然会回来。
Unfortunately, there was something urgent for me to deal with in our company on the 16th, so I had to fly back regretfully from Beijing for extra work.
不巧的是16号单位有事，不得不赶回来加班，于是带着遗憾从北京飞回来。
She felt the dizzy drop, then the supporting lift of the swing. When she opened her eyes she was looking up into the blue sky and was about to fly back through the door.
在一阵让人头晕的坠落之后，她感到自己被秋千上的绳子拉着，当她再次睁开眼睛时，已经置身于一片蓝天之中了，正要荡回谷仓去。
She felt the dizzy drop, then the supporting lift of the swing. When she opened her eyes she was looking up into the blue sky and was about to fly back through the door.
在一阵让人头晕的坠落之后，她感到自己被秋千上的绳子拉着，当她再次睁开眼睛时，已经置身于一片蓝天之中了，正要荡回谷仓去。
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