查询词典 fertility

Soil erosion is one of the main environmental problems in the world ,it is the root cause of land deterioration 、 soil fertility degression、 soil physico -chemical quality bad、 land use capability felling and ecological environment deterioration.

土壤侵蚀是世界上的主要环境问题之一，是造成土地退化、土壤肥力下降、土壤理化性质变劣、土地利用率降低、生态环境恶化的根本原因。

Nicholas Eberstadt, a demographer at the American Enterprise Institute, puts it with only mild exaggeration: changing fertility patterns mean that "2,500 years of East Asian family tradition stand to come to an end with the region's rising generation."

美国企业研究所的人口统计学家尼古拉斯？埃伯施塔特用稍微夸张的手法对此作了解释：变化的生育模式意味着"东亚维持了2500年的家庭传统模式将在这一地区正在成长的一代人中走向终结"。

The real cause, argues Nick Eberstadt, a demographer at the American Enterprise Institute, a think-tank in Washington, DC, is not any country's particular policy but "the fateful collision between overweening son preference, the use of rapidly spreading prenatal sex-determination technology and declining fertility."

真正的原因，尼克艾伯斯塔德，一名美国企业研究所的人口统计学家，华盛顿特区智能团专家说，不仅仅是因为任何国家的人口政策，而是"严重的对男孩的偏爱，以及广泛运用的出生前婴儿性别检测和选择性生育"。

The process is important in terms of soil fertility since the products of denitrification e.g.

根据土壤的肥力情况反硝化作用显得十分重要。

It's denseness prolificacy fertility make a sharp contrast with the sparse and poor native soil.

它稠密、多产、肥沃，与当地稀疏、贫瘠的土壤形成鲜明的对比。

First of all, as the forests disappeared, the propagation decreased, while some kinds of plants and animals were even close to deracination or had already died out. Next, the natural disasters, such as flood, drought, and tornado, etc. broke out more frequently and strongly. Again, without the protection by forests, soil erosion and fertility decline together with other problems appeared. Finally, forest vicissitude also had negative effect to social economy and people's lives.

首先是由于森林面积的减少，导致一些森林动植物的数量减少，濒临灭绝，甚至消失；其次，森林的变迁导致海南岛水灾、旱灾和风灾等自然灾害发生次数增加，强度加大；再次，土地失去森林的保护而引发严重的水土流失和土壤肥力下降等种种问题；最后，森林的变迁还对社会经济及人们的生活产生不利的影响。

Of couples with fertility voluntarily not to have children, that is what we call "DINK family."

对具有生育能力的夫妇自愿不要孩子，就是我们所说的"丁克家庭"。

The total influence is the sum of the direct influence and the indirect influence. By comparing the total influence of the economic-social factors and the bearing-controlled factors, this paper makes out the primary effect factor of the fertility level.

直接影响与间接影响之和即为总影响，通过比较经济社会因素和生育控制因素对生育水平的总影响，解析出1990年代中国生育水平的主要影响因素。

The results indicated that the soil physical fertility characteristic of super high-production cornfield was high, mainly display in the topsoil was deep, soil bulk density changed between 1.01-1.26 g/cm3, disarrangement rate of soil structure was...

研究结果表明，超高产玉米田土壤物理肥力特性较高，主要表现在耕层较深厚，土壤容重变化在1.01～1.26g/cm3，土壤的结构破坏率较低；在土壤的化学环境特征方面，土壤碱解氮、速效磷、速效钾等均未表现出明显的变化规律；所有超高产田的土壤阳离子交换量均不同程度地高于普通生产田，这与超高产田的定向培育有直接关系；一些超高产田有机质低于普通生产田，其原因与超高产田氮素施用量较高、促进了土壤有机质矿化有关。

There may be room for expansion, but the fertility of the lands is questionable, and the thick forests may tactically prove disasterous to the wide open type of combat your horsemen prefer.

这里或许是你扩张的地方，但是这片土地的肥沃与否不得而知，更何况这里浓密的森林对于适宜在开阔地形上作战的骑兵来说简直就是灾难。

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。