27 篇文章
Greening the walls and roofs of our buildings
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Greening the walls and roofs of our buildings 绿化建筑的外墙和屋顶

but once within these city walls,
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but once within these city walls, 但是在城区内

Once inside the city walls, they head for one place.
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Once inside the city walls, they head for one place. 一旦穿过城墙 它们就直奔目的地

And the walls had one further surprise.
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And the walls had one further surprise. 而石壁上还有更惊人的发现

The walls were covered with the most delicate and fragile crystals.
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The walls were covered with the most delicate and fragile crystals. 石壁上布满了光洁美丽的脆弱结晶

which spend part of their day resting on cave walls.
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which spend part of their day resting on cave walls. 它们一天大部分时间都呆在洞壁上

The bats roost high on the walls and ceilings
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The bats roost high on the walls and ceilings 这些蝙蝠倒挂在洞壁和天顶上