distinguish (as a compound or molecule) by introducing a labeled atom
distinguish (an element or atom) by using a radioactive isotope or an isotope of unusual mass for tracing through chemical reactions
造句
An indelible pen for labeling clothing. 一種為衣物作標(biāo)簽用的其筆跡很難去掉的筆
A collection of data in which each item is uniquely identified by a label, by its position relative to the other items or by some other means. 數(shù)據(jù)的一種集合，其中每一項(xiàng)可唯一地被一個(gè)標(biāo)號(hào)或相對(duì)于其它項(xiàng)的位置或某些其它方法所標(biāo)識(shí)。
An alternate name or label used to refer to the same element or a point in a program. 一個(gè)別名或替換標(biāo)號(hào)，可用來指程序中的某一數(shù)據(jù)元素或某一位置。