改种

He encouraged farmers to come to see what he was doing and to alternate their crops with these plants.

他欢迎农户们到他的试验田上参观他的成果，并鼓励他们改种这些作物。

So Chinese people started to vaccinate cowpox. By the end of seventeen of twenty century, the smallpox was eradicated all over the world.

从此中国人开始改种牛痘。20世纪70年代末，全世界终于消灭了天花。

Six fungicides were selected for controlling the damping-off of tomato seedling.

番茄猝倒病是番茄育苗期常见的一种病害，发生时，幼苗成片死亡，最后可使整个苗床幼苗发病，导致因死苗而重播或改种，延误农时，对蔬菜生产影响很大[1]。

One approach might be to encourage uses of marshland that do not desiccate the peat—for example, growing moisture-loving rubber trees rather than oil palms, which need dry soils.

方法之一就是鼓励开发未失水泥炭的沼泽地，比如，改种喜温的橡胶树而不种油棕榈树，因为橡胶树需要干土生长。

Crops that do not need much water are difficult to grow in the High Plains.

文中说"改种需水较少的庄稼来节约水资源"，这是方法而不是困难

Invertase level could be used as a comprehensive index of soil fertility.

结论］蔗糖酶活性可作为评价水田改种香蕉土壤肥力的敏感指标。

The international community has spent years trying to reduce dependency on opium for poor farmers who are reluctant to switch to licit crops because they are less profitable.

国际社会多年来试图减少贫穷农民对鸦片的依赖，农民则因为收益较低而不愿意改种合法作物。

But swarmed changing of the planting led to the over production and the fall of price, and farmers were prepared to cut those useless maidenhair trees.

而一窝蜂的改种，导致产品过剩，价格下跌，现在农民们有准备砍去这些变成废物的银杏树了。

It was a move to promote replanting, following deforestation, and to plant up treeless areas.

这是移动促进改种，跟随砍伐森林，和种植无树木的区域。

One day, when I mentioned to my neighbour that I was going to remove the low growing hedge, pittosporum, and replace them with my favorite maples, her face changed and said "Ah! Maple drop leaves in winter. It is so messy. We moved from New York over here to avoid that."

有天， 当我向我的邻居提到我想要移除海桐科的矮篱，然后改种我最钟爱的枫树，她脸色一沉就说：&噢，枫树在冬天会掉叶而显得非常脏乱，我们就是从纽约搬到这里以避开那种情形的。&

Chrysanthemum of 10 thousand birthday is lax to edaphic requirement, with the arenaceous qualitative loam with fecund, good drainage had better.

万寿菊对土壤要求不严，以肥沃。排水良好的砂质壤土为好。

He unstepped the mast and furled the sail and tied it.

他拔下桅杆，把帆卷起，系住。