1. The main causes resulting in this situation are intense compaction, pressure solution, cementation, filling, carbonatization and recrystallization, but...
   文中还论证了地表样品中识别埋藏古溶蚀的标志。
2. High purity amygdalin was obtained from apricot kernel by the process of enzyme destruction, defatting, solvents extraction and recrystallization.
   苦杏仁经灭酶、脱脂、萃取、重结晶,制得高纯苦杏仁苷。
3. METHODS The hydroxyl groups of magnolol were protected using ketol reaction and the products were purified by recrystallization from hexane.
   方法将厚朴酚两羟基用缩酮保护,再用正己烷重结晶分离纯化。
4. The calcite deposits are derived from the recrystallization of the carbonatite as a result of the weathering, eluviation of the fault, and the thermal contact activity and the metamorphism.
   方解石矿有三个显著特征：即白色、块大、致密。

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