您要查找的是不是：
- shifting species boundaries 物种分布界限移动
- Bacteria can incorporate genes from other dead bacteria, exchange genes with living bacteria, and can exchange plasmids across species boundaries. 细菌可以合并其它死亡细菌的基因，可以与活的细菌交流基因，还可以跨物种界限交换质粒。
- Finally he got a job shifting rails in a factory. 最后他在一家工厂找到一个搬钢轨的工作。
- The Left is shifting its ground. 左派正在改变立场。
- An hour later they came off the night shift. 一个钟头之后他们下夜班了。
- Do wolves belong to the canine species? 狼是犬科动物吗？
- Opinion is shifting in favour of the new scheme. 舆论正逐渐转向支持新计画。
- We should do our best to save endangered species. 我们应该竭尽全力挽救濒于灭绝的生物。
- He had to make shift with what was on hand. 他只好用现有的东西将就应付。
- He always tries to shift the blame to someone else. 他总是试图将过错推卸给别人。
- He had to make a shift with what was on hand. 他只好用现有的东西将就应付。
- This rare bird has become an endangered species. 这种珍禽已成为濒临灭绝的物种。
- No detergent can shift these stains. 任何清洁剂都不能除掉这些污迹。
- He was wearing a strange species of hat. 他戴着一种奇怪的帽子。
- You have to shift as you drive around the corner. 你拐角时要换挡变速。
- They were taking turns to be on the night shift. 他们轮流做夜班。
- Should I shift gears before making a turn? 我拐弯之前该不该换挡?
- There are many species of chrysanthemum. 菊花品种很多。
- Today the survival of our species is threatened. 今天人类的生存受到了威胁。
- The giant panda has become an endangered species. 大熊猫已成了一种濒临灭绝的动物。
