harmful

US /ˈhɑ:rmfl/

UK /ˈhɑ:mfl/

A2 初級英檢中級多益
adj.形容詞傷害的 ; 有害的
Looking at the sun is harmful to your eyes

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為什麼雲霄飛車的環路不是圓形的? (Why roller coaster loops aren't circular)

06:27為什麼雲霄飛車的環路不是圓形的? (Why roller coaster loops aren't circular)