- indefinite
- 不一定: uncertain; not sure; not nec ...
- 的: 4次方是 The fourth power of 2 i ...
- 不一定: uncertain; not sure; not necessarily so
- 一定的: bound; certain; definite; determinateunvarying; fixed; given; sure; uniform; unvarying
- 不一定对: transnational river basin
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