The etiologic agent may not be apparent on direct smear.

在直接涂片上致病菌可能不明确.

辞典例句

Direct smear of sputum was conducted with Ziehl - Neelsen acid - fast staining to detect tubercle bacillus.

将痰液直接涂片,萋 - 尼氏抗酸染色检查结核杆菌.

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You say and convenient ( direct smear - cream ) the effect of good why not in use?

你说又方便 ( 直接涂抹 —— 乳膏 ) 效果又好为什么不用 呢 ?

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