... 零预层 zero presheaf 零元素 nil element 零圆 null circle ...
双语例句
1
If you call cons on nil, Lisp treats nil as an empty list and builds a list of one element.
如果对nil调用cons, Lisp将nil作为空列表对待,并构建一个含一个元素的列表。
2
If there is only one element in the list (the (CDR args_list) portion on line 2 returns nil), return the single element (the (car args_list) on line 3).