If you do choose to consume beverages that stain, consider using a straw so the liquid is not hitting off your teeth.(如果你真的选择喝那些会在牙齿上留下污渍的饮料，你可以考虑用吸管，这样饮料就不会碰到你的牙齿。)
Immaculate means "without stain."(无原罪就是“无污点“的意思。)
Now if I can stain in some way, if I can somehow label the DNA fragments that I'm interested in, I could find out where those fragments are on this gel.(现在如果我有染色的某种方法，如果玩可以以某种方式对我感兴趣的DNA片段进行标记，我就能知道这些片段在这凝胶板上的位置。)
Microscopically, a gram stain reveals gram-negative diplococci within a neutrophil, typical for Neisseria meningitidis.(在显微镜下，革兰氏染色显示中性粒细胞内有革兰氏阴性双球菌，这是脑膜炎奈瑟氏球菌的典型特征。)
The damp rising from the ground caused the walls to stain badly.(地面上升起的湿气使墙壁的颜色变得很难看。)
They stain the mouse's brain tissue, so that different kinds of synapses show up in different colors.(他们对老鼠的脑组织进行染色，这样不同种类的突触就可以呈现不同颜色。)
When travelling abroad, people should be extremely careful of their actions as their misbehaviours will stain their motherland's reputation.(出国旅游时，人们应该多加留意自己的行为，因为他们不恰当的行为会玷污他们祖国的声誉。)
Using too much water could spread the stain.(用水太多可能使污迹扩散。)
For instance, they were used to stain previously invisible microbes and bacteria, allowing researchers to identify such bacilli as tuberculosis, cholera, and anthrax.(例如，用它们来给以前看不见的微生物和细菌染色，从而使研究人员能够识别出结核、霍乱和炭疽等杆菌。)
