insteps

The stereocontrol synthesis of 4 β-methyl-5 α-cholestane ( 6) from cholesterol ( 1) insteps was reported.

本文报道以胆甾醇为原料经四步反应立体控制合成4β-甲基-5α-胆甾烷（6）的新路线。

the engineers solved the problem insteps.

工程师们逐步地解决了那个问题。

inverted insteps of both feet , crawling on floor

双脚板反脚背，在地上爬行

There was once a little girl who was very pretty and delicate, but in summer she was forced to run about with bare feet, she was so poor, and in winter wear very large wooden shoes, which made her little insteps quite red, and that looked so dangerous!

红鞋从前有一个小女孩——一个非常可爱的、漂亮的小女孩。不过她夏天得打着一双赤脚走路，因为她很贫穷。冬天她拖着一双沉重的木鞋，脚背都给磨红了，这是很不好受的。