ふりこ
帆立貝: Yesso scallop (Mizuhopecten yessoensis)
(computing) built-in function
question, problem on homework etc. / a question; a matter (of time etc.) / a problem (something that needs to be dealt with); a trouble / an issue; a matter
振り子: pendulum
He was observing the movement of the pendulum.
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DiQt(ディクト)
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