Petri's tests
[医] 陪替氏试验(检尿蛋白质)
🧩 词语组成解析
n. 测验（test的复数）
🗣️ 情景例句
Please fill it out completely.
请全部填写。
Nothing is difficult to the man who will try.
世上无难事，只要人肯试。
How did the bees know exactly in which diection to fly?
蜜蜂是怎样确切地知道朝哪个方向飞呢？