threaten the existence of
... icing the dam to break out and solve naturally on a large scale, will threaten the existence of their mountain valley. The only chance to live is to move to other...
...流傳下去 Language learning is an important way to maintain the special languages.
希望對你有幫助 1. D 2. C 3.A 4.D 5.B 6.C 7.C 8.D 9.C 不對不要打我喔