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汉语拼音：tǔ céng

1.土地的表层。

2.在母质之上的土壤层，在其中发生土壤形成自然过程，在良好发育的土壤中，这一土壤层变得与其母质大不相同并包括A和B层位。

1. 土地的表层。

   冯牧 《沿着澜沧江的激流》：“随着年复一年的江水的涨落，它们所据以生长的土层都被波浪冲刷干净了，但它们仍然是在枝叶繁茂地生长着。”如：那里的耕地多在山坡，也有部分梯田，土层较薄，水土流失严重。

• Irrigation timing is important due to light rather shallow soils.

  由于土壤轻松,土层又浅,及时灌溉是很重要的.

• Bentonite is an expandable three - layer clay mineral.

  皂土是一种可膨胀的土层粘土矿物.

• Horizons, as described above, are a simplification.

  上述土层是一种简单划分.

• This repsents a boundary where the water seeps out of the soil into air.

  这个边界是水从土层中渗出进入空气的地方.

• We will consider first the case of two - dimensional incompressible steady flow through orthotropic soil.

  我们首先考虑二 维 不可压缩流体通过正交各向异性土层的定常流动.

• This is a technique whereby land is scraped from above in order to fined coal.

  这是削去表面土层来获取煤的一种开采技术.

• The gardener talked about the proper substrate for acid - loving plants.

  园艺师讨论了适合喜酸性植物的土层.

• It became entombed in the permafrost, where it remained until recently freed.

  它被掩埋在永久冻土层里, 直到最近才被挖掘出来.

• Generally, sand magnifies vibration, while viscous powder soil damps vibration.

  砂土层一般起放大作用, 粘质粉土层一般起减震作用.

• Xiashu Loess is a kind of geographical special soil in Zhenjiang area.

  下蜀黄土是镇江地区广泛分布的一种特殊性土层.

• The ground grows layer appropriate deep, measurable and wet.

  地栽土层宜深厚, 适度湿润.

• New England has many trees and thin, rocky soil.

  新英格兰有许多树木和薄薄的岩石土层.

• Below a portion of the estate was a rich bed of clay.

  这块地的下面是丰富的粘土层.

• During 0 - 70 cm , intercropping & lt ; monocropping & lt ; mixed cropping, the absorbed water from soil.

  0 ～ 70cm 土层, 间作群体吸收的土壤水分大于单作群体, 混作群体吸收的土壤水分小于单作群体.

• The conclusion is suggested for the case of cohesionless soils preferably.

  本文的结论似较适用于无粘性土层.