Natural sera
[医] 天然血清, 正常血清
🧩 词语组成解析
natural
['nætʃrəl]
adj. 自然的;物质的;天生的;不做作的;
n. 自然的事情;（生来的）白痴;[乐]（风琴等的）白键;
natur=nature自然+al...的 →自然（界）的
浆液, 血清\\n[医] 血清; 浆液
🗣️ 情景例句
and the problem is that it's set up primarily for kids to play.
而问题是它主要是让孩子们去玩的。
Love thy neighbours as thyself.
爱邻如爱己。
But they would not listen to him. When they came to the river, a white man was waiting in the boat for them.
但是他们不听，当他们来到江边时，一个白人正在船上等着他们。