Various approaches have been used to improve the performance of adapted indigenous stock, including cross-breeding and upgrading through back-crossing with improved breeds, and within-line selection.
已有多种方法被用于提高地方良种的性能，包括杂交育种，以及通过与良种的回交和品系内选育进行的品种改良。
It was a great relief to be back on dry land after such a rough crossing.
渡过汹涌澎湃的大海回到陆地后使人长舒一口气。
Meanwhile, back at the farm, the man who had bought his farm happened to be crossing a small stream on the property one day when he saw something gleaming at the bottom of the stream.
与此同时，在原来那个农场，那个买下农场的人一天碰巧跨过农场里的一条小溪，他看见溪底有什么东西在闪闪发光。
This was only the third vehicle crossing of Antarctica in history, and the first to get there and back.
这是历史上仅有的第三次驾驶交通工具的南极穿越，更是第一次往返。
By employing use cases, global test resources gain back some of the knowledge that may have been lost crossing cultural boundaries.
通过使用用例，全球的测试资源挽回一些在跨越文化边境的过程中可能丢失的文化。
Martin knew of the enormous gulf between him and this man - the gulf the books had made; but he found no difficulty in crossing back over that gulf.
马丁知道他跟自己之间有一道很大的鸿沟——那是读书造成的。他要是愿意跨回去倒也容易。
In her most recent esca-pade, she ran to the nearest high school-crossing several busy streets to get there-hopped in the back of a truck headed south and ended up near Hamilton, almost 50 miles away.
她在最近一次恶作剧中跑到了最近的高中——穿过了几条繁忙的街道——跳进驶向南方的卡车后部，最后在近50英里外的汉密尔顿结束旅程。
We've been all the way to the moon and back, but have trouble crossing the street to meet the new neighbor.
我们登上了月球，并成功返回，却不能穿过街道去拜访新邻居。
Further back, several of the complex rings of Saturn can be seen crossing the image horizontally.
更后面，几条复杂的土星环横贯画面。
Now take that piece of dangling gold thread and go back and forth over and around the angel, crossing over the chest and back and under the arms to secure it all.
现在用金线绕着天使的胸、背部和臂下来回缠绕。
"Go back!” cried the first goat: "There is no room for you to pass here where I am crossing.""It
“回去！”第一只山羊喊道，“我过桥的时候没有地方让你过去。”
It has been there since December, slowly criss-crossing the 65km between St Croix and St Thomas, periodically surfacing and then diving back down again to depths of 4, 000 metres.
从12月份开始就一直在那里，慢慢的在StCroix和StThomas之间交叉往来65公里，周期性的浮出水面再潜回4000米的深处。
Well, do be careful, because crossing the line from friends to lovers, even if it's only for one big kiss, means no going back.
你要小心啊，越过那条界限，从朋友成为恋人，哪怕只是一个亲吻，也代表没有回头路可走了。
We've been all the way to the moon and back, but have trouble crossing the street to meet a new neighbour.
我们经过重重困难到了月亮又回来，却觉得过一条街去见一位新邻居是一种麻烦。
Players and coaches also seem likely to be crossing back and forth across the Pacific, though Silver was vague about exact plans.
球员和教练也可能横跨太平洋，虽然私立我对确切的计划没有明确表述。
Using back-country roads, they eventually got to the border crossing and talked their way over.
取道偏僻的乡村之路，经过和当地士兵的交涉，他们最终得以越过边境。
By the time the sunset comes, you've probably forgotten which country you're in. You've been crossing borders back and forth so frequently.
到了日暮时分，你大概已经忘记自己究竟在哪个国家了，因为一整天下来一直不断跨越国界。
But on crossing it, I found nothing special. Looking back, I realized that life over there wasn't so bad.
我很想告诉他，可能翻过去山后面，你会发觉没有什么特别，回头看会觉得这边更好。
Pipe sticking phenomenon appears sometimes during pull-back stage of pipeline crossing with horizontally directional drilling, which results in crossing failure and great economic loss.
在水平定向钻穿越管道回拖环节中，容易出现卡管现象，导致穿越失败，造成巨大的经济损失。
The whole skill of back flop in teaching can be divided into four parts, approaching, taking off, crossing bar clearance, landing.
在背越式跳高的完整技术教学过程中，其技术构成可分为四个部分：助跑、起跳、过杆、落地。
Well, she went and came back as soon as she could, but on her way back she was frightened to see some old elves of the blue petticoat crossing her path though it was midday.
所以嘛，女人想着早点去早点回，但是路上，她惊恐地发现——迷雾中有什么挡着路？许多穿着蓝色衬裙的小精灵？
So mildly disappointed we wandered along the banks of the river Thames crossing over the Millennium Bridge before making our way back on the other side.
带着一丝失望，我们在回去之前沿着泰晤士河的沿岸走，从另一边穿过千禧桥。
Be careful on the way to school and back home. Be sure to look at the traffic lights when crossing the road.
上学、放学的路上注意安全，过马路时要看红绿灯。
Looking back at the crossing point across the tracks.
回头看穿过铁轨要经过的“断墙”。
We 've been all the way to the moon and back, but have trouble crossing the street to meet the new neighbor.
我们登上了月球，并成功返回，却不能穿过街道去拜访新邻居。
Robert: When I was crossing the street, I was almost hit by a car. Fortunately, I jumped back in time.
罗伯特：当我过马路时，差点被一辆小车撞上了。幸亏我及时往后跳开。
On my way back, I can vaguely distinguish the scenes in the wild field after crossing a bridge. Low clouds are moving slowing in the distance as if rocks on the mountains are moving too.
回来的路上，过了桥，依稀可以分辨出田野中的景色，云脚在飘移，仿佛山上的石头在移动。
On my way back, I can vaguely distinguish the scenes in the wild field after crossing a bridge. Low clouds are moving slowing in the distance as if rocks on the mountains are moving too.
回来的路上，过了桥，依稀可以分辨出田野中的景色，云脚在飘移，仿佛山上的石头在移动。
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