The youth fully displayed their courage and skill in the football field.小伙子们在绿茵场上大显身手.Policemen had to escort the referee from the football field.警察不得不护送这位裁判离开足球场.You'll find Billy on the football field.在足球场上能找到比利....
无差异曲线通常呈凸形.An indifference curve is usually assumed to be convex.凸形孔制程,提高探针准确度.Dual probe guiding hole drilling process for accurate probe contact.此外, 凸形轮和凹形轮的轴杆等部位若出现松动现象,也会造成压痕线不清晰.In addition, convexes and concave whe...