它还经受着日晒、雨淋、气候变化及化学物质的腐蚀。
It also suffers from sun, rain, climate change and chemical corrosion.
如今，科学家已经掌握了把某些化学物质撒在云层上以人工 造雨的方法。
Now scientists have learned to make rain by salting clouds with certain chemicals.
如今，科学家已经掌握了把某些化学物质撒在云层上以人工 造雨的方法。
Now scientists have learned to make rain by salting clouds with certain chemicals.
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