...a certain make of wristwatch.是什么意思？

...a certain make of wristwatch.

某种品牌的手表

certain

adj. 某一，必然的，已确定的；pron. [动词用复数]某些；

例句
Paramedics are trained to administer certain drugs.
护理人员们接受了配发某些药物的培训。

make

vt. 做，制造，生产，制定，使成为，使产生；vi. 开始，尝试，行进，增大；n. 制造，生产量，性格，形状，样式；

例句
I can't abide people who can't make up their minds...
我受不了优柔寡断的人。

of

prep. 关于，属于…的，由…制成；aux. 助动词 [非标准用语、方言] =have [主用于虚拟语气]；

例句
He did have a real knowledge of the country...
他对该国的确知之甚多。

wristwatch

n. 手表；

例句
By the 1930s the wristwatch had almost completely supplanted the pocket watch.
到了 20 世纪 30 年代，手表几乎完全取代了怀表。