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。

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Ants store food, repel attackers and use chemical signals to contact one another in case of attack.

蚂蚁储存食物，击退攻击者，并使用化学信号联系彼此以防被攻击。

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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。

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The blast-proof bus has armour-plated glass and was thought to offer protection from chemical attack.

BBC: Margaret Thatcher 'battle bus' sells in Towcester auction

Should such a treaty be concluded, this country will assuredly lose its ability to retaliate in kind against chemical attack.

CENTERFORSECURITYPOLICY: Center for Security Policy | Chemical Weapons Arms Control: Formula For Disaster For US Security

The other difference is that there is no mistaking a chemical attack when it happens, because its victims die almost instantly.

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