她的拼写一直很差。

Her spelling has always been ___poor.

萨姆游泳技术很差。

Sam's a ___poor swimmer.

从青少年时期起，我就经常画画，但没有受过任何教导，所以我的技巧很差。

Since I was a teenager, I've often drawn and painted but without any kind of teaching, so my technique is ___poor.