成为四倍

Along with rapid development of bio-technology, artificial chromosome doubling in vitro is the efficiency approach of producing polyploidy plants. Advances on in vitro induction of autotetraploid in plants was reviewed.

随着生物技术的迅速发展，通过植物离体组织人工诱导多倍体已经成为获得多倍体植株的有效途径，本文就植物离体组织染色体加倍诱导同源四倍体的研究进展做一介绍。

The most disturbing of the Geomancer's power, however, is his ability to separate his being into multiple selves, each as powerful as the original and making him potentially four times the trouble for the unlucky who encounter him.

然而土占师最扰人的能力是他能将自身的存在分离产生多个另体，每个另体的能力都与本体不相上下，让他成为惹上他的倒楣鬼的四倍大的大麻烦。

Tissue culture was a new and efficient way to obtain tetraploid melon.

组织培养可以成为获得四倍体甜瓜的有效途径。

With the stable genetic tetraploidy and the fertility in the nature environments, this allotetraploid population presented the key factors to form a new species with 200 chromosomes.

异源四倍体鲫鲤稳定的染色体数目和正常的性腺结构以及自然条件下的生殖传代行为，说明该异源四倍体鲫鲤已成为一个染色体数目为4n=200、遗传性状稳定的新型四倍体鱼群体，具备形成新种所需的关键因素。

With the stble genetic tetraploidy and the fertility in the nature environments, this allotetraploid population presented the key factors to form a new species with 200 chromosomes.

异源四倍体鲫鲤稳定的染色体数目和正常的性腺结构以及自然条件下的生殖传代行为，说明该异源四倍体鲫鲤已成为一个染色体数目为4n=200、遗传性状稳定的新型四倍体鱼群体，具备形成新种所需的关键因素。

Transgenic triploid fish can be produced in large scale by crossing transgenic allotetraploid fish with transgenic diploid fish.

湖南师范大学生命科学学院成功的研制了雌雄可育的异源四倍体鲫鲤，并已成为一个种群。

The velocity of sound in water is 4900 ft Per second ,or more than four times its velocity in air

水中的声速成为每秒4900英尺，比空气中的声速大三倍多（直译则为：……是空气中声速的四倍多

Yet, with the economy growing at 12 percent, the fastest rate since 1995, and set to overtake Germany as the world's number three economy by the end of the year (although China's economy guzzles four times as much fuel as Germany), some Chinese officials describe the present economic performance as "the best for 5,000 years"!

然而，随着经济增长率达到12%，是1995以来最快的经济增长率，而且将在年底超越德国成为世界第三经济实体(虽然中国经济消耗的能源四倍于德国)，一些中国官员把现在的经济表现说成是&5，000年之未有&！

If, however, the root cell is one of the rare tetraploid cells (a cell having four sets of chromosomes that arise spontaneously in the root), it may develop into a nodule.

如果这个根细胞是罕见的四倍体细胞（一种在根部自然拥有四套染色体的细胞），它就可能生长成为根瘤。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。