辩认

yǒu shí tā shèn zhì huái yí tā shén me shí hou cái néng xué huì biàn rèn dì bǎn hé chuāng tái bǎn

有时她甚至怀疑她什么时候才能学会辩认地板和窗台板。

And she sometimes wondered if he 'd ever learn to distinguish between planking and sills.