您要查找的是不是：
- improved soil layer 地基改良
- Mr. Smith gave a lesson on how to improve soil . 史密斯先生讲了一堂如何改良土壤的课。
- The particle size scope is in 0 ~ 50mm that It can test in the soil layer. 可以测试的土体的颗粒粒径范围为0~50mm。
- He gave a lesson on how to improve soil. 他讲了一堂如何改良土壤的课。
- He studied how to improve soil condition. 他研究如何改良土壤。
- He studied how to improve soil conditions. 他研究怎样改善土壤条件。
- Mr. Smith gave a lesson on how to improve soil. 史密斯先生讲了一堂如何改良土壤的课。
- Soil adhesion may be reduced even if water cannot readily permeate the soil layer. 即使水不易进入污垢内层，也能降低污垢的吸附作用。
- On the nitrate-N accumulated characteristics in deep soil layer of winter wheat field in Taihang Piedmont. 太行山山前平原冬小麦田深层土体硝态氮累积特征研究
- It is showed that the sodication was the serious, the less aggregate of soil was, but that in improved soil increased obviously. 这说明土壤碱化程度越大，团粒结构越少；改良后土壤的团粒结构明显增加。
- The deposition in an underlying soil layer of colloids, soluble salts, and mineral particles leached out of an overlying soil layer. 淀积作用胶状物，可溶性盐和矿物微粒从上层土壤向下层过滤的沉淀过程
- The professor studied how to improve soil conditions. 这位教授研究如何改良土壤状况。
- Species number ranked in the following order: brush and herb layer > tree layer > litter layer > soil layer. 每样地的物种数量都是以灌木草本层最多，依次为乔木层、枯枝落叶层和土壤层。
- A green manure is a crop grown mainly to improve soil fertility. 种植绿肥作物主要是为使土壤更加肥沃。
- The soil layer of Rouli is 700 to 800 meters deep. Experts have verified it is the thickest soil layer on earth. 若笠的黄土层厚达七、八百米，经过专家证实，是整个地球黄土层最厚的地方。
- Wow. So this stuff could help feed people and improve soil. 哇，看来这种物质能够提高产量，还能改善土壤。
- Remanent magnetism of soil layer is taken as a reference frame for locating hy-drocarbon seepage zone. 本文利用土壤剩余磁性作为确定烃类渗漏带的参考系。
- A mixture of decaying organic matter, as from leaves and manure, used to improve soil structure and provide nutrients. 堆肥腐烂有机体的混合物，如树叶或粪便，用来改善土壤结构并增加土壤养分
- The soil layer of this village is rich in nutrients, and thus suitable for cultivation. 这个村庄土层里的养分肥沃，适合耕种。
- The depth of casing should ensure it can penetrate dirty soft soil layer; its bottom should be tightly sealed. 护筒的埋设深度，应确保穿透淤泥质软土层，并做好护筒底部密封。
