密度是由树木的生长方式决定的。
为什么冰岛的生长季节很短?
没有充足的授粉,玉米的生长就会受阻。
Without sufficient pollination, the growth of the corn is stunted.
It is not exactly the same thing, but there is something real that it grows, that I'm not responsible for it that allows us simplicity.
并不是完全一样的事情,但是有一个事实,那就是树在生长,而并不是我让它在生长,就是这样简单。
If you could introduce that gene you'd make the chemical, in this case it's a protein called vascular endothelial growth factor.
通过导入一种生成特殊化学物质的基因,这种疗法中指的是一种蛋白,叫做血管内皮生长因子
If there are droughts, pests, other things that interfere with the growing of the food you've got problems.
如果发生旱灾,虫灾,或其他妨碍食物生长的灾害,你就有麻烦了
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