Dry stone walls may appear stark and lifeless, but they provide a valuable habitat for plants and animals.
干燥的石墙看上去荒凉而且没有生命迹象，但是它们却为动植物提供了宝贵的栖居地。
《柯林斯英汉双解大词典》
2
The walls last a surprisingly long time, resisting the lapping tide with the help of energetic patching and fresh buckets of dry sand.
令人惊讶的是，这堵沙墙竟挺立了许久，由于大量修补、新置干沙，竟抵挡住千层浪的攻击。
3
Known as the "low countries" because much of the land is now below sea level, many of the country's largest cities are kept dry only by huge walls holding back the sea.