Permeaselectivity
选择渗透性
🗣️ 情景例句
There is, Dad.
有， 爸爸。
Are there reserved seats on the train?
车上有预订座位吗？
Bring the picnic basket up here, under this big tree, said Ann.
“把野餐篮子拿到这儿来，放在这棵大树下，”安说。