Substantia compacta
[医] 骨密质
🧩 词语组成解析
nigra[解]黑质, 塞梅林氏神经节
[医]（蜕膜）致密层
🗣️ 情景例句
I've been having a hard time keeping my eyes open
我一直挣扎着要让双眼睁开
He can't decide what to do.
他不能决定做什么。
I have quite a lot of homework to do.
我有很多家庭作业要做。