The whole flavones obtained from leaves of hawthorn by the methods of boiling water, alcohol extraction, dilute alcohol percolation, lead salt sedimentation and lime cream sedimentation were extracted.
采用水煮醇提法、稀醇渗漉法、铅盐沉淀法和石灰水沉淀法所提得山楂叶总黄酮,顺次以石油醚、乙醚、乙酸乙酯和正丁醇进行萃取。
Pour boiling water on the leaves and let the tea draw for three minutes.
把开水倒在茶叶上,让茶泡3分钟.
Put a lid on a pan when boiling water. 6.
烧水时把壶盖盖好。
Put a lid on a pan when boiling water.
烧水时在锅上盖好盖子。
The bread knife should be dipped in boiling water before cutting the butter.
切黄油之前,面包刀应该先在开水里浸泡一下.
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