In test tubes, that looks like two grains of salt.

在试管中看起来就像是两粒盐。

(1)Put some iron nails at the bottom of a test tube.

(1)把几枚铁钉放入试管底部。

Half-fill a test tube with water and add two or three clean nails.

(1)在试管中注入一半水，加入 2 到 3 枚干净的铁钉。

Of course, foodies don't run experiments in test tubes or petri dishes.

当然，美食家不会在试管或培养皿中进行实验。

Bottom line: " You can't scream a cure out of a test tube."

“你不可能对着试管大叫就得到解药。”

The researchers grew the bacteria together in a test tube, in the presence of both antibiotics.

研究人员在一个实验试管两种抗生素都存在的情况下将这两种菌株同时培养。

These concepts are as vital to epidemiologists as microscopes and test tubes are to other infectious disease scientists.

这些概念对于流行病学家来说，就像显微镜和试管对于其他传染病科学家一样重要。

By the time he was in graduate school, Jacob had evolved from playing with test tubes to manipulating molecules.

但到 Jacob 上研究生时，他已经从玩试管进步到操纵分子了。

But since researchers saw this in test tubes, they had no idea what this meant for immunity in real life.

但由于研究人员是在试管中看到的这种细胞，他们不知道它对真实生命的免疫力的意义。

Testing for coagulase is done by transferring a colony of the suspected bacteria into a test tube containing fibrinogen-rich plasma.

通过将待测细菌的菌落转移到装有富含纤维蛋白原血浆的试管中可对凝固酶进行测试。