MESSENGER science team members will also be studying the shallow ridges that crisscross Machaut's floor.
“信使号”科学团队也将对这些交错地表的沟槽进行研究。
In Australia, a shallow soil is scraped into ridges on which trees are planted.
在澳大利亚把表层土壤作垄，果树栽在垄上。
Treatments included conventional tillage, subsoiling, straw mulch, tied ridges, shallow pits surface and no tillage.
试验处理包括常规耕作、深松、秸秆覆盖、垄作、浅坑及免耕。
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