Practically, sources of variation may be cultivars, or related species.

The highly susceptible cultivars act as disease centre in the fields.

种植高感品种在田间有发病中心的作用.

P 333 promoted callus induction of three cultivars other than Dixie Green.

PP333仅对迪斯绿有抑制作用,而对其它3个品种起一定的促进作用.

This practice reduces the incidence of bare wood on trees of many cultivars.

这个措施对许多品种的植株说来,能减少光秃枝的出现.

Grafting of root stocks with named scion cultivars was well understood by the Romans.

用已经命名的栽培品种稼接在砧木上这种技术已经为罗马人所熟知.

Some cultivars also form fruit buds on the tips of the current season's vegetative shoots.

一些栽培品种也在当年的生长枝的顶端形成花芽.

Not only the number of cultivars developed, but also many have the prominence attained.

不仅因为品种的数量增加了, 而且许多品种是卓越的.

Some cultivars are more susceptible to mold damage than others.

有些品种比其它品种对毒害更敏感.

Such rootstocks or cultivars were reproduced true to type by vegetative propagation.

这些钻木和品种,通过无性繁殖长成和亲本一样的类型.

Many cultivars become more astringent when grown under cool summer temperatures.

生长于夏季凉爽地区的许多品种则变得较有涩味.

Estonia has done much to cultivate the friendship of western European countries.

爱沙尼亚努力发展与西欧国家的友谊。

John always tries to cultivate people who might be able to help him.

约翰总是试图结识能给予他帮助的人.

China was the first country in the world to cultivate silkworms and develop silk weaving . More than 3,000 years ago, sericulture and silk weaving were already significantly developed.

中国是世界上最早发明养蚕和丝织的国家;早在3,000多年以前, 蚕桑、丝织已相当发达.

He always tries to cultivate cadres who might be able to help him.

他总是试图结识能给予他帮助的干部.

One should cultivate good manners from childhood.

一个人从小要学讲礼貌.

We should work hard to cultivate in young people the revolutionary style of learning diligently and taking pleasure in helping others.

我们要在青少年中大力提倡勤奋学习助人为乐的革命风尚.

We should cultivate the good habits of diligence and frugality.

我们要养成勤俭节约的好风气.

We need to cultivate support in this direction.

我们需要在这方面协力争取支持.

Even so should one cultivate a limitless heart with regard to all beings.

他更应当对一切众生,长养无量慈心.

How to cultivate and what kind of personnel to cultivate are urgent challenges for our educators.

怎样培养和培养什么样的人才已经向教育界提出了严峻的挑战.

But which do they cultivate?

但他们具有什么品质 呢 ?