Selemion
一种均质离子交换膜
🗣️ 情景例句
but I prefer a two-story home.
但我喜欢两层楼的房子。
Eagles fly alone,but sheep flock together.
鹰爱独飞羊爱群。
But the first people who were like ourselves lived so long ago that even their sagas, if they had any, are forgotten.
但是，和我们相似的原始人生活的年代太久远了，因此，有关他们的传说既使有如今也失传了。