1. 变量：Last-Modified实体头域(entity-header)指明了变量(variant)被源服务器所确信的最后修改的日期和时间. 此头域的确切含义取决于源服务器的实现和源资源(original resource)的性质. 对文件而言,它可能仅仅指示文件上次修改的时间.

2. 公共查询·英语单词大全

2. 可变类型：可变类型(Variant)是指可以在程序运行期间确定或改变的数据类型. 这些数据在编译期间不能确定其数据类型,而且,它们比固定类型的数据占用更多的存储空间和更多的操作时间. Object Pascal的子程序分为两种:过程(procedure)和函数(function).

3. variant

3. 变异体：即使在同一发育阶段, 有些虫种抗原亦可产生变化.如布氏锥虫虫体表面的糖蛋白膜抗原不断更新,新变异体(variant)不断产生,总是与宿主特异抗体合成形成时间差.⑵ 分子模拟与伪装 有些寄生虫体表能表达与宿主组织抗原相似的成分,

1. 变体;变种;变化形式
    A variant of a particular thing is something that has a different form to that thing, although it is related to it.

    e.g. The quagga was a strikingly beautiful variant of the zebra...
           斑驴是一种极美丽的斑马变种。
    e.g. An intriguing variant to pipelines would be to carry the water using the existing system of canals...
           除用管道外，利用现有的运河系统来输送水也很值得一试。

1. something a little different from others of the same type

    e.g. an experimental version of the night fighter
           a variant of the same word
           an emery wheel is the modern variation of a grindstone
           the boy is a younger edition of his father

    Synonym: versionvariationedition

2. a variable quantity that is random

    Synonym: random variablevariatestochastic variablechance variable

3. an event that departs from expectations

    Synonym: discrepancyvariance

4. (biology) a group of organisms within a species that differ in trivial ways from similar groups

    e.g. a new strain of microorganisms

    Synonym: formstrainvar.

1. differing from a norm or standard

    e.g. a variant spelling

2. exhibiting variation and change

    e.g. letters variant in size