chemical etching的用法和樣例：
例句
- Chemical weathering was beginning to attack the unweathered bedrock.
化學侵蝕作用開始攻擊還未侵蝕的岩床。 - The wall must be protected against chemical attack from highly corrosive components of the combusting gases.
必須把室壁保護起來以防止來自燃氣的高度腐蝕性成分的化學侵蝕。 - Depending on the system specified, these products provide increased chemical resistance to strong acids, salts, and solvents, and hydrofluoric acid exposure.
根據系統的特性，這些產品可以表現更好的耐強酸鹼，溶劑和氫氟酸化學腐蝕。
