Việt
vòng có răng lượn sóng
nếp nhăn trên vật đúc
Anh
corrugated toothed ring
downy
undulary
undulated
casting lap
pleat
pucker
puckering
reinforcing crease
ripple
ruga
wrinkle
corrugated toothed ring, downy, undulary, undulated
casting lap, pleat, pucker, puckering, reinforcing crease, ripple, ruga, undulated, wrinkle