Backtracing
[计] 返回探索
🗣️ 情景例句
He is on another line right now.
他正在接另一个电话。
Truth is honest, truth is sure; Truth is strong and must endure.
真理不会骗人，切实无假；真理的力量强大，永存不垮。
Ideas are dangerous.
思想是危险的。