afford的形容詞怎么寫

　　We usually start off with the more affordable methods.

　　我們通常從更便宜的`方法開始。

　　The demand for more affordable glasses rose drastically.

　　對更便宜眼鏡的需求急劇上升。

　　Congratulations! Affordable housing is rare in this city.

　　恭喜你！這座城市經濟適用房很少。