I pushed the problem aside; at present it was insoluble.

我把这个问题放到了一边；目前它是无法解决的。

Carotenes are insoluble in water and soluble in oils and fats.

胡萝卜素不溶于水，但溶于油和脂肪。

A mask of pure insoluble collagen fibre is placed over the skin.

一张纯不溶性胶原纤维面膜敷于皮肤上。