[228-130] informal
adj.不拘礼节的，随便的[228-130] indefinite
adj.不明确的；不定的(infinite，unlimited)[228-130] potential
adj.可能的；潜在的(possible，conceivable)[228-130] contingent
adj.可能发生的(accidental，unforeseen)[228-130] dispensable
adj.可有可无的(unnecessary，unimportant)[228-130] occasional
adj.偶然的(accidental，haphazard)[228-130] fortuitously
adv.偶然地，意外地(accidentally，coincidentally)[228-130] haphazard
adj.偶然的；随便的(casual，random，indiscriminate)[228-130] random
adj.任意的，随意的(patternless，unplanned)