Sparsity
n. 稀疏, 稀少, 贫乏
🗣️ 情景例句
I have just begun to learn and my serve isn't very good.
我刚刚开始学习，发球不太好。
History repeats itself.
历史本身常重演。
Will it cause a delay?
会耽搁出货吗？