Poured concrete retains walls work well in the heavy or unstable soil and steep slopes, making other walls inadvisable.

在重质或不稳定的土壤和陡峭的斜坡上，浇注混凝土挡土墙效果良好，让其他墙成为不明智的选择。

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Unstable soil with potential to fall into excavations and injure workers.

不牢固的土方将可能掉入开挖区内并伤及工人。

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Poured concrete retaining walls work well where heavy or unstable soil and steep slopes make other walls inadvisable.

现浇混凝土挡土墙以及在繁重的工作或不稳定的土壤和陡坡作出其他墙壁不明智的。

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Public works officials said that more roads were being closed than opened due to unstable soil conditions.

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She worries that the unstable soil in her neighborhood could begin to erode, possibly carrying houses with it.

NPR: Venezuela Copes with Crumbling Infrastructure

He said the clay soil had absorbed recent rain and snow, making it more unstable.

BBC: Wet weather causes a rise in landslips in Jersey