他们是一球形 、 环形或锥形的一部分.They are portions of a sphere, a torus or a cone.可以认为锥形的自由基比较活泼.It is argued that the pyramidal radical would be more reactive.并且锥体和锥形圈可以是双锥形的.Both the conic ring and the cone may be double ones....
Public institutions will survive these cutbacks because state monies will continue to underwrite operating expenses.公立院校将渡过这种削减的困难,因为州财政将同意继续承担办学费用.They have undertaken to underwrite a large proportion of the supermarket...