Extremely small as bacteria are, they often cause diseases.
虽然细菌很小，它们常常引起疾病。
Bacteria are often a cause of disease.
细菌常常引起疾病。
I see. His teeth are exposed to decay-producing bacteria too often.
我明白了。这样的话，他的牙齿太容易遭受到腐蚀性的细菌的侵蚀了。
Antibiotics, therefore, are often not effective because they target bacteria.
如果使用抗生素，往往不能奏效，因为他们的目标是细菌。
Antibiotics, therefore, are often not effective because they target bacteria.
如果使用抗生素，往往不能奏效，因为他们的目标是细菌。
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