酸可减少钢表面的酸可溶性物质，使得表面的高反应性的铬处于复合氧化物形式。
The acid depletes the steel surface of acid soluble species, leaving the highly reactive chromium on the surface in a compounded oxide form.
大豆粉的醚溶性成分及乙醇提取物中均含有抑制桑蚕摄食的忌避因子，酸溶性成分中还存在对蚕有毒性的物质。
The extractive components from soybean meal by ether or ethanol all contained repellent substances poisonous to silkworm in the ether-soluble component of soybean meal.
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