海底扩张 Traditional 海底擴張 hǎi dǐ kuò zhāng 🔊 seafloor spreading (geology) + Keep this word Meanings hǎi dǐ kuò zhāng 海底擴張 seafloor spreading (geology) Its characters 海hǎioceanHSK 3底dǐbottom; baseHSK 4扩kuòto enlargeHSK 7–9张zhāngto open upHSK 3