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
And then make your own decision.
然后你自己做决定。
Everything is good in its season.
万物逢时皆美好。
It's about four hundred yards down this street.
城堡就在这条街上，（离这儿）400码左右。