if基本解释
conj,（表条件）如果；即使；是否；（表假设）假如,同近
We’ll stay at home if it rains..如果下雨，我们就待在家里。
（表条件）如果；即使；是否；（表假设）假如英释中释conjused when talking about something that might happen or be true, or might have happened
as if,犹如，好似.短语
