【化】 酶半衰期

be too smart by half; cunning outwits itself.

half built-up crank shaft

half-angle thread flank measurement【机】

half-moon

half exact contravariant functor【数】

half-mast

semielliptical【数】;half elliptical【数】

either-way operation【通信】;half-duplex operation【通信】