美味一起等
界限的英文：
demarcation/dividing line； limits； bounds.
例句：
1、They have far overstepped the boundary of friendship. / Their relationship has gone beyond friendship.
2、His ambition knows no end/bounds.
3、Frontier between love and friendship.
yuyu88yuyu
英文也很丰富：还可用：fuzzy，confused，unclear，etcambigious是个‘大’词，口语中不常用。Vague好些，有故意躲躲闪闪的味道。
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