Spatial filtering
[计] 空间滤波
🧩 词语组成解析
[计] 过滤
🗣️ 情景例句
which has been vacant for over a year now,
已空了一年多，
Which one is easier?
哪一个是较简单的？
Letters will cost a little more, but they will certainly travel faster.
这样会稍微多花点钱，但肯定是快得多了。