Attack by scavengers and bacteria, chemical decay, and destruction by erosion and other geologic agencies make the odds against preservation very high.
食腐动物和细菌的攻击、化学性腐烂，以及侵蚀和其他地质作用的破坏，导致无法保存的可能性非常大。
The bacteria in plaque make poisons that attack the gums.
牙菌斑中的细菌会产生损伤牙龈的毒素。
The bane of biofilms: Bacteria bound together in a protective matrix tend to resist viral attack.
生物膜的祸根：细菌粘合到一起形成一个防护型的整体，可以抵抗病毒的攻击。
For billions of years, certain bacteria and fungi have produced chemical substances to protect them from attack from other microorganisms.
数十亿年以来，某些细菌和真菌通过产生化学物质来保护自己，抵御来自其它微生物的攻击。
Bacteriophages are viruses that attack and eat bacteria.
噬菌体是一种攻击并吞食细菌的病毒。
Since antibiotics are not very selective as to which bacteria they attack, those prescribed for a toothache can quickly wipe out a whole population of intestinal microbes.
因为抗生素对它要对抗的细菌没有很大的选择性，为治牙疼而开出抗生素可能会很快杀死一大批大肠中的细菌。
Compounds in black tea can attack the bacteria that form plaque and prevent the plaque from sticking to teeth, U. S. researchers found.
美国的研究人员发现，红茶中的多种化合物可以杀灭导致牙菌斑的细菌，也可以防止牙菌斑粘附在牙齿上。
You need food, particularly sweet and sticky food, for the bacteria in your mouth to produce acids that will attack the tooth enamel (outer surface of the tooth).
你需要食物，特别是甜食和粘性食物，你口腔中的细菌就会利用它产酸并损害牙釉质（牙齿表面光亮的那一层）。
It wants to call over the troops for an attack, so it releases bacteria encoded with packets of information in the form of DNA.
他希望召集战友发起攻击，并释放以DNA形式封装指令的细菌。
We found that for every viral strategy of attack, the bacteria would adapt to defend itself, which triggered an endless cycle of co-evolutionary change.
我们发现细菌能对病毒每一种进攻策略产生适应机制以保护自己，而这又触发了病毒下一次的进化，形成无止境的循环。
When antibiotics enter the body, they attack bacteria, either destroying them or making them unable to multiply.
抗生素进入人体后，会对细菌发动攻击，把细菌杀死或使细菌无法繁殖。
The new strategy involves implanting into the gums antibiotics or other germ killers so that they can attack bacteria in the pockets where they fester.
新的方式是在牙龈内植入抗菌素或其他能杀死细菌的药物，这些药物可以在产生溃烂的地方杀死细菌。
These viruses attack bacteria.
这些病毒会攻击细菌。
Zinc is critical for the immune system - it rallies white blood cells, to attack bacteria and viruses like a flu or cold.
锌对免疫系统至关重要——它可以促进白细胞生长，消灭可导致流感或感冒等疾病的细菌和病毒。
In just one hour, plaque bacteria will start converting sugar and starch particles into harmful acids that attack the tooth enamel.
短短一小时，已足够让牙垢膜细菌把糖份及淀粉质转化为有害的酸性物质，侵蚀珐琅质。
When the body is under attack from harmful micro-organisms be it a virus, cancer, or bacteria the immune system will go into action to deal with the invaders.
如果机体受到有害的微生物威胁时，比如病毒、癌细胞或者细菌，免疫系统就会发起免疫作用对抗这些入侵者。
A study that compared heart attack victims to healthy volunteers found the heart patients had higher Numbers of bacteria in their mouths, the researchers said.
研究人员说，通过对心脏病人和健康受试者进行比较，发现心脏病人口腔内的细菌数目更多。
The drugs the scientists had been studying are antibiotics that attack a subunit of the malaria parasite called the apicoplast, which has some similarities with bacteria.
科学家一直在研究的这些药物是一些抗菌素，它们可以对名叫质体样细胞器的疟疾寄生虫的亚单元进行攻击，这与细菌有些类似。
The job is particularly difficult in the case of chlamydiae because these bacteria have special ways of protecting themselves from attack by the cellular branch of the immune system.
这项工作在对抗披衣菌上，更是困难，因为披衣菌拥有特殊的自保之道，可以躲掉免疫系统当中细胞免疫的攻击。
Phagocytes are important in defending animals against the attack of bacteria.
吞噬细胞在保卫动物不受细菌侵袭方面是很重要的。
One theory is that oral bacteria travel into the bloodstream where it may attach to fatty plaques in the arteries, causing inflammation and setting the stage for a heart attack.
一种假设认为口腔细菌会进入血液，依附在动脉的脂肪斑块上，导致发炎，进而引起心脏疾病。你是否存在这类风险呢？
The new films are provided with antibacterial properties which particularly attack the feared Escherichia Coli (E. Coli) bacteria.
这款具有抗菌性能的新薄膜产品尤其能够抵御大肠杆菌。
The new films are provided with antibacterial properties which particularly attack the feared Escherichia Coli (E. Coli) bacteria.
这款具有抗菌性能的新薄膜产品尤其能够抵御大肠杆菌。
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