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生活中一些事情的发生有“一定”“不可能”和“可能”这三种情况。“一定”的答案是唯一的,没有第二种答案,属于确定事件,具有确定性。如右图飞机飞行的方式只有一种,即一定要在空中才能飞行,所以可以说飞机一定要在空中飞行。“不可能”的答案也是唯一的,同样属于确定事件,具有确定性,与“一定”是对立的。如厦门鼓浪屿的秋天是不可能下雪的。因为厦门属亚热带海洋季风气候,年均气温21℃,所以可以说鼓浪屿的
Some things happen in life are “certain”, “impossible” and “possible” these three cases. “Certain ” The answer is the only, there is no second answer, belong to determine the event, with certainty. As shown on the right, there is only one way for an aircraft to fly, that is, it must fly in the sky, so it can be said that the aircraft must fly in the air. “Impossible ” The answer is also unique, also belong to determine the event, with certainty, and “must ” is the opposite. Such as Xiamen Gulangyu autumn is impossible to snow. Because Xiamen is a subtropical marine monsoon climate, with an average annual temperature of 21 ℃, it can be said Gulangyu