结果表明，三交种株高、叶绿素含量、穗长等性状与单交种的变异系数差异不显著，但群体抽穗历期延长；
The variation coefficient of TCH was similar to CKs in plant height, chlorophyll content, panicle length, and so on. The heading duration of TCH population was longer than those of CKs.
经过一段时间，形成一种混合物，它包含实验室毒株的内部成分以及大流行毒株的外部成分。
After a while, a hybrid is formed which contains the inner components of the laboratory strain, and the outer components of the pandemic strain.
这两种抗体具有广泛的中和性，也就是说对目前发现的数千种HIV毒株中的大部分都适用。
They are 'broadly neutralizing,' which means they can target most of the many thousands of HIV strains.
古斯塔沃·帕拉西奥斯正在对一种刚从一只西班牙蝙蝠中发现的新的埃博拉病毒株进行基因测序。——这是个令人不安的消息，因为这种病毒以往只在非洲地区发现过。
Gustavo Palacios was sequencing the genes from a new strain of Ebola virus found in a bat in Spain - a worrisome development, since the fatal virus has almost never been found outside Africa.
有些病人感染的病毒株对其他所有常用药物都产生了耐药性，这两种新的药物为他们带来了希望。
These two new drugs offered hope to patients infected with virus strains resistant to almost all other classes of drugs designed to fight aids.18.
测定了11种(株)标准分枝杆菌，2株人工培养耐药株及11株临床分枝杆菌菌株的细胞单糖成分。
Cellular monosaccharides of 11 species of standard mycobacterium, 2 strains of resistive medication and 11 strains of clinical cellular monosaccharides were determined.
即使在感染你的时候，感冒病毒也会发生变异，而且新的病毒毒株经常出现，以至于当制药商研制出针对其中一种变异的疫苗时，血清已经过时了。
Colds mutate even while they're infecting you, and new strains pop up so often that by the time drug-makers create a vaccine against one variation, the serum is already out of date.
为了验证此一想法，研究人员培育出三种酵母突变株。
To test this idea, the researchers created three mutant strains of yeast.
在美国旧金山，发现了一种对现有市场上的所有蛋白酶抑制剂都耐药的HIV病毒株。
An HIV strain resistant to all protease inhibitor drugs currently on the market turns up in San Francisco.
在1997年以前，西尼罗河病毒并未被认为对鸟类具有致病性，但就在那时，以色列出现了一种能够导致多种鸟类出现脑炎和麻痹症状继而死亡的毒力更强的毒株。
Before 1997 WNV was not considered pathogenic for birds, but at that time in Israel a more virulent strain caused the death of different bird species presenting signs of encephalitis and paralysis.
就这样一次种一株，年复一年，这个不知名的女人永远地地改变了她所居住的世界，她创造了无法形容的壮丽、美好和感动。
Just planting one bulb at a time, year after year, this unknown woman had forever changedthe world in which she lived. She had created something of ineffable magnificence, beauty, andinspiration.
相关研究结果发表在《自然》（Nature）和《科学》（Science）期刊上，将帮助科学家们确定哪一种病毒株应该加入到流感疫苗中。全世界每年有3亿人注射流感疫苗。
The research, published in the journals Nature and Science, will help scientists decide which viral strains should be incorporated in the flu vaccines given to 300m people a year worldwide.
研究也对大流行病毒株的起源机制提出了一种新的认识。
The research also gives new insights into the mechanism of the genesis of a pandemic strain.
流感专家说，那些结果非常令人不安，因为猪被认为是一种混合载体，在那里禽流感和人类流感病毒可能会结合形成新的病毒株。
Those results are especially worrisome, flu experts say, because pigs are believed to be mixing vessels in which avian and human flu viruses can combine into new strains.
科学家们已经发现了99种已知的鼻病毒株，他们相信还有更多的鼻病毒没有被发现。
Scientists have identified 99 known strains of rhinovirus and figure there are many more out there.
今年的季节流感疫苗含有三种流感病毒——一种甲型（H3N2）病毒，一种与猪流感毒株无关的常规季节性甲型（H1N1）病毒，以及一种乙型病毒。
This year’s seasonal vaccine contains three influenza viruses — one A (H3N2) virus, one regular seasonal A (H1N1) virus unrelated to the swine flu strain and one B virus.
而那种蛋白质是病毒变化最快的部分，因此，针对一种病毒株的抗体可能识别不出另一种病毒株。
But that protein is the fastest-changing part of the virus, so antibodies to one strain might not recognize another.
但是自然选择是一种强大的力量，而如果疾病的传播意味着这些药物将被广泛使用的话，一种具有抗药性的病毒毒株可能将轻易地进化出来。
But natural selection is a powerful force, and if the spread of the disease means they have to be used widely, a resistant strain of the virus could easily evolve.
这样一来，植株就可以排列的更为紧密，每英亩产量也随之翻番，每一层楼内都可以种好几排矮株作物。
So plants could be packed tighter, doubling yield per acre, and multiple layers of dwarf crops could be grown per floor.
2001年，乔治·布什颁发命令，禁止联邦资金支持新胚胎干细胞株的研究，这实际上是一种妥协，意味着科学家们只能对业已产生的胚胎干细胞进行研究。
In 2001 George Bush issued a ban on federal funding of research on new embryonic stem-cell lines-a compromise that meant that scientists could only work with cells from the batches they already had.
但树和灌木就是很难区分的，因为没有一种方法来区分一棵树和一株灌木，其中一种不知不觉地渐变为另一种。
But tree and bush are hardly that, since there is no way to define a tree versus a bush. The two categories grade insensibly into one another.
栽一株兰花吧，用肥沃的泥土培育，浇上纯净的水，每天给它晒晒太阳，洗洗叶子上的灰尘，用心栽培，也是一种生活。
Planted an orchid bar, with fertile soil cultivation, and pour pure water a day to give it the sun, wash the dust off the leaves, carefully cultivated an image of life.
栽一株兰花吧，用肥沃的泥土培育，浇上纯净的水，每天给它晒晒太阳，洗洗叶子上的灰尘，用心栽培，也是一种生活。
Planted an orchid bar, with fertile soil cultivation, and pour pure water a day to give it the sun, wash the dust off the leaves, carefully cultivated an image of life.
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