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。
Poured concrete retains walls work well in the heavy or unstable soil and steep slopes, making other walls inadvisable.
全球变暖以及西方世界对愈来愈依赖少数几个（而且正在变少）敌对或不稳定国家的油气也令人担心。
Meanwhile, concern is swelling both aboutglobal warming, and about the Western world's increasing dependence on ashrinking number of hostile or unstable countries for imports of oil and gas.
如果没有妨碍使用这些应用程序的其他原因(比如许可证问题或不稳定)，这个电子表格可以简化为图10。
If there are no other reasons that argue against these applications such as licensing issues or instability, the spreadsheet can be simplified as shown in figure 10.
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