鲁宾斯坦数

certain number───一定数量

license number───牌照号码；登记号码

Cutter number───刀号

Fibonacci number───斐波纳契数

accession number───n.图书馆对新添的书籍，画册等的编号

broken number───断号

counting number───自然数；计数（counting是count的现在分词）

number of new mothers fear, in some way, that they don't quite make the grade because parenting doesn't come as naturally as they expected it would," says Rubenstein.───Rubenstein说，在某种程度上很多的新妈妈害怕，她们不是十分成功因为养育孩子不是她们期望那样天生就会的。