express的形容詞詞形式是什么?

　　The expressional sites in young stalk are in phloem.

　　幼莖表達分布在韌皮部；

　　Smile" is one of the expressional tongues of body language."

　　“笑”是人體語言（態勢語）中的表情語之一。

　　People have discussed a lot about color, color words and their expressional functions.

　　人們對色彩、色彩詞以及它們的表情功能有過不少論述。