单词	groundsheet
释义	groundsheet noun ground·​sheet ˈgrau̇n(d)-ˌshēt  : ground cloth Example Sentences Recent Examples on the Web Car campers may pay, but hikers just spread out a groundsheet and a sleeping bag, and the spot is theirs; only a bear can pull rank. Nicholas Kristof, National Geographic, 8 Sep. 2020 Word History First Known Use 1907, in the meaning defined above
随便看	opting out option option to buy optional optional pass optional referendum optional writ optionalities optionality optionalize optionally optionals optionary optioned optionees optioning options optive opto- optoelectronic optoelectronics optokinetic optologists optometers optometric

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