海底擴張說 hǎi dǐ kuò zhāng shuō

DEFINITIONS

  1. theory of seafloor spreading (geology)

CHARACTERS

海 hǎi
HSK 4
sea, ocean; maritime
底 dǐ
HSK 4
bottom, underneath, underside
擴 kuò expand, enlarge, stretch
張 zhāng stretch, extend, expand; sheet
說 shuō speak, say, talk; scold, upbraid