Discusses non-native plants, such as the kudzu vine and the tree-of-heaven, which were imported from other countries and now pose a significant threat to the ecosystems of North America.
野葛和臭椿这样的非本土植物，它们就是从其他国家迁移而来的，现在已经给北美的生态系统造成了极大的威胁。
The needles on the tree point heavenward symbols of man's prayers as they go toward heaven.
树上指向天国方向的针叶象征着人类走向天国时的祈祷。
The tree, like the longings of the earth, stand a tiptoe to peep at the heaven.
树木，仿佛是来自大地的渴慕，正踮着脚尖向着天堂窥探。
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