Is a clever hard soil; hard is the key to smart.

勤奋是聪明的土壤，勤学是聪明的钥匙。

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Hydraulic back-hoe dredger is a new type of dredger developed and specially for handling hard soil and stone.

液压反铲挖掘船是近几年国际上新出现的一种新型挖掘作业船，专门挖掘硬质土和石块。

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Paving and roofing is hard soil called "al Ga", top of the hall and dormitory have a skylight, for lighting, air mediation.

铺地和盖屋顶用的是叫“阿尔嘎”的硬土，各大厅和寝室的顶部都有天窗，便于采光，调解空气。

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In the past, it often has been hard to get complete information about current soil conditions.

VOA: special.2009.01.20

As the mulch breaks down, it provides material that keeps the soil from getting hard.

VOA: special.2009.06.30

Rivers are drying up, grazing land for cattle is scarce, and the dry soil is hard to farm.

VOA: standard.2010.04.01

In June last year, the yard was ready to be seeded with grasses and wildflowers selected by the company's meadow specialist, Ed Yates, to work well with the region's hard-packed soil and dry conditions.

WSJ: Meadows Instead of Lawns Are in Fashion in Residential Landscaping

The region's hard-packed clay soil welcomes a unique mix of plants with deep-penetrating root systems.

WSJ: Meadows Instead of Lawns Are in Fashion in Residential Landscaping

While the caesium is hard for plants and animals to take up when it is tightly bound to the soil, once in solution (dissolved in water) it can be more readily absorbed.

BBC: Daunting challenge of Fukushima clean-up