http://www.immi.gov.au/Visas/Pages/155-157.aspx:
...
have not spent two of the last five years in Australia as a permanent resident or citizen, but are the partner or dependent family member of a person who holds a subclass 155 visa, or who has also applied for a Resident Return visa and satisfies criteria for grant.
仔细看了楼上的链接,未住满2年的但有满足申请155类签证的家庭成员在澳洲的pr,可以申请155签证,但拿到签证后最多只有一年的自由出入澳洲的时间。不知我的理解是否正确,原文如下:
If you are granted a Subclass 155 Resident Return visa because you are a family member of a person who holds a Subclass 155, or who has also applied for Resident Return Visa and satisfies criteria for grant, then your travel facility will be for either a year or less than a year from date of grant.
感谢楼上各位!