兽医通过检查羽毛来确定这只鸟的性别。

The vet ___determines the sex of the bird by checking its feathers.

这个表格需要填写你的年龄和性别。

Please indicate your age and ___sex on this form.

他们讨论了与性别相关的健康和安全问题。

They discussed health and safety issues related to ___gender.

兽医通过观察羽毛来辨别小鸡的性别。

The vet ___sexes the chicks by examining their feathers.