给定一个英文句子和单词长度的限制，返回句子中长度超过限制的单词组成的列表。


句子：I like to travel by train because it's convenient and affordable.
长度限制：5
超过长度限制的单词为：travel, because, convenient, affordable。返回列表为 ["travel", "because", "convenient", "affordable"]。