Water had also appeared on other planets like Mars but，unlike the earth，it had disappeared later。
It is unlike sb to do sth。做某事不是某人的特点。
例句：It is unlike him to behave so rudely.
② likely （adj）可能的
be likely/ unlikely to do sth可能/不大可能做某事
It is likely/ unlikely that … 可能/不可能…
● The weather is likely to get worse. 天气可能会变得更糟。