单词	self-activity
释义	self-activity noun self-ac·​tiv·​i·​ty ˌself-ˌak-ˈti-və-tē  : independent and especially self-determined activity Word History First Known Use 1644, in the meaning defined above
随便看	on trial on TV on view on vinyl on waivers on welfare on what basis on work release on your mark on's staircase on, plain of on-again, off-again on-air on-and-off on-base per on-base percentage on-brand on-dit on-dits on-glaze on-glide on-license on-off on-plant on-ramp

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