He straightened up and slipped his hands in his pockets.他挺直身子，把手插进口袋里。My sister had come in with her calm common sense and straightened them out.我姐姐凭着自己的镇定和常识帮着把这些问题都解决了。Each time he straightened his pudgy knees it was a...
Comparing with polyurethane, the prospects of the applications of isobutene telechelic oligomer are presented.并与聚氨酯材料相比较;说明了聚异丁遥爪预聚物的主要应用前景.Tert - octylamine was prepared with di - isobutene and hydrocyanic acid as mine ...