my favorite invention用 is watch 还是are watches?速度啊!

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myfavoriteinvention用iswatch还是arewatches?速度啊!myfavoriteinvention用iswatch还是arewatches?速度啊!myfavoritein

my favorite invention用 is watch 还是are watches?速度啊!
my favorite invention用 is watch 还是are watches?
速度啊!

my favorite invention用 is watch 还是are watches?速度啊!
第一个,表示一类物品的统称.