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
to help you find a house now.
帮助你们找房子。
Hope for the best, but prepare for the worst.
作最好的希望，作最坏的打算。
it is not always safe by the time it reaches the tap.
等水到达龙头时就不一定总是安全的了。