sex sth
及物动词，宾语通常是需要鉴定性别的动物或幼崽。
The technician sexed the chicks soon after they hatched.
技术员在小鸡孵化后不久就鉴定了它们的性别。
确定(动物)的性别；区别...的性别；引起...的性欲
determine the sex of (an animal)
确定(动物)的性别
To determine the sex of (an animal).
一般现在时
Farmers sex chickens to separate males and females.
农民们辨别鸡的性别，以便将公母分开。
一般过去时
The vet sexed the kitten yesterday.
兽医昨天辨别了这只小猫的性别。
现在完成时
We have sexed all the puppies before the sale.
在出售之前，我们已经辨别了所有小狗的性别。
规则动词，过去式和过去分词均为 sexed。
The veterinarian will sex the chicks to separate the males from the females.
兽医将鉴别小鸡的性别，以区分公母。
用法提示：此句中 sex 作动词，表示鉴别（动物）的性别。
We sexed the puppies when they were two weeks old.
我们在小狗两周大的时候鉴别了它们的性别。
用法提示：sexed 是 sex 的过去式，表示鉴别（动物）的性别。
It takes practice to sex adult birds quickly.
快速鉴别成年鸟类的性别需要练习。
用法提示：此处 sex 为及物动词，后接动物名词，表示鉴别其性别。
及物动词，宾语通常是需要鉴定性别的动物或幼崽。
The technician sexed the chicks soon after they hatched.
技术员在小鸡孵化后不久就鉴定了它们的性别。
常用被动语态，强调动物是被鉴定的对象。
The birds were sexed before being released into the wild.
这些鸟在被放归野外之前接受了性别鉴定。
by 或 using 后接鉴定性别所依据的方法或特征。
Researchers sex the fledglings by measuring the length of their wings.
研究人员通过测量幼鸟的翅长来鉴定它们的性别。
grammar · medium
易错句子The vet sexs the chicks.
正确表达The vet sexes the chicks.
动词 sex 以 -x 结尾，第三人称单数要加 -es，写成 sexes，不能只加 -s。汉语没有动词随主语变形的规则，所以容易漏掉这一变化。
grammar · medium
易错句子Sex chicks takes a lot of practice.
正确表达Sexing chicks takes a lot of practice.
英语里动词原形不能直接作主语，必须用动名词 sexing；汉语动词可以原样作主语，因此常常漏掉 -ing。
grammar · medium
易错句子The vet sexing the chicks right now.
正确表达The vet is sexing the chicks right now.
英语现在进行时必须是 be + 现在分词（is sexing）；汉语“正在……”不需要系动词，所以容易漏掉 is。
鉴别一日龄雏鸡的性别
Workers sex day-old chicks by checking their wing feathers.
工人通过检查翅膀羽毛来鉴别一日龄雏鸡的性别。
鉴别这些鸟的性别
Breeders sex the birds before deciding which pairs to keep.
饲养者在决定保留哪些配对之前，先鉴别这些鸟的性别。
鉴别马驹的性别
The vet sexed the foal minutes after it was born.
马驹出生几分钟后，兽医就鉴别了它的性别。
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