解决了最初的一些问题之后，终于成功地制造出了大量丙酮。After some initial problems, acetone was successfully produced in quantity.这两个氨基酸从丙酮酸获得它们的碳架.These two amino acids derive their carbon skeletons from pyruvate.将乙酰丙酮铁, 苯基B- 萘胺及磷脂通过40目筛加入.The fer...
大炮轰击了敌军阵地.Cannons bombarded enemy lines.我们的重炮轰击堡垒的墙.Our heavy guns pounded the walls of the fort.重炮对着要塞外墙 ( 不停地 ) 轰击.The heavy guns pounded ( away at ) the walls of the fort....