yìng suān ㄧㄥˋ ㄙㄨㄢ 硬酸
②去质子化的二齿双胍作为硬lewis 碱（Hard Basic）能够与作为lewis 硬酸（Hard acid）的VO 2+ 牢固结合。（两点缺一不可!
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软硬酸碱 HSAB ; SHAB ; Soft Hard Acid Base
软硬酸碱理论 HSAB ; SHAB ; HSAB principle
硬脂酸 [有化] Stearic acid ; Triple Pressed Stearic Acid ; stearic acid
硬脂酸钙 [有化] Calcium stearate ; CaSt
硬脂酸钠 [有化] sodium stearate ; RCOONa
硬脂酸镁 [有化] Magnesium stearate ; MgSt
硬脂酸锌 [有化] Zinc stearate ; Stearic acid zinc salt
地衣硬酸 lichesterinic acid
原地衣硬酸 Protolichesterinic acid
在淡水湖泊中，属于硬酸的元素主要以游离离子存在。
In fresh water lake, trace elements belonging to hard acid exist mainly as free ion.
这种物质硬如磐石（石灰石主要就是由碳酸钙构成的），但易溶于酸。
The stuff is tough as a rock (limestone is made primarily of calcium carbonate), but it dissolves instantly in acid.
果实椭圆形，直径约3至6厘米，内部稍硬，很容易剥皮，撕开皮后，你会发现果肉柔软，吃起来微甜中透着酸。
The fruit is an oval shape and about 3-6 cm in diameter. Inside the slightly hard, but easily peal able skin, you can find a soft fruit that tastes slightly sweet, with a possible sour tinge.
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