🧩 词语组成解析
[医] 脑白质
🗣️ 情景例句
whom I think you've met once or twice before.
我想你以前见过他一两次面。
I could swear I've been here before.
我敢发誓我曾经来过这儿。
Alternatively, if the star were small, the life-supporting planet would have to have a close orbit round it and also provide the perfect conditions for life forms to develop.
反之，如果恒星很小，维持生命的行星就要在离恒星很近的轨道上运行，而且要有极好的条件才能使生命得以发展，