The phenyl ofp n propylbenzoic acid could be reduced by sodium alkoxide.醇钠可以还原对丙基苯甲酸中的苯环.Poly ( L - lactide ) ( PLLA ) was synthesized by ring - opening polymerization of L - lactide using cyclic tin alkoxide compound as...
Knock at my window at eight o'clock and I'll be ready.8点钟敲我的窗,我会准备好的。There was a light knock at the door.有人在轻轻地敲门。They heard a knock at the front door.他们听到前门有人敲门。...