Frontiers
n. 边界( frontier的名词复数 ); 边境; 开发地区的边缘; 尚待开发的领域
🗣️ 情景例句
Good! I'm interested in your advice.
好！我对你的建议很感兴趣。
I believe there is no way out of this forest.
我相信没有路可以从这森林走出去。
The clouds had come down so suddenly we had no warning.
乌云突然出现，我们丝毫没有觉察。