1) They are sold in pairs.
它们成对出售。
2) We sell them by set.
我们成对出售。
3) They are sold at high prices.
它们售价很高。
4) They oppose each other also complement each other.
它们相辅相成。
补充资料：它们
1.代词。称不止一个的事物。
说明：补充资料仅用于学习参考，请勿用于其它任何用途。
参考词条