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问题: Give Me HELP

a. The forests at the source of the Yellow River are becoming smaller. What’s the phrease ‘at the source of’ in the sentence mean ?
b. The future of our planet is at stake. What’s the phrease ‘at sake’ in this sentence mean????????
Thanks for all every person that tries to answer this question.

解答:

1黄海源头一带
2在危险中