weak acid的用法和樣例：
例句
- Amino acids are weak acids and weak bases, therefore, they are excellent buffering agents.
氨基酸是弱酸和弱堿，因此，它們是很好的緩沖劑。 - Using normal alkalic shower gel will destroy the weak acidic environment and weaken the protective action.
但使用一般堿性沐浴露，會(huì )破壞私處的弱酸環(huán)境，減弱保護作用。
