词汇	The first bell has rung
释义	The first bell has rung. 预备铃声响了。
随便看	oxidationreduction titration oxidation reduction titration oxidation-reduction titration oxidation -reduction titration oxidation-reduction tritimetry oxidation-reduction wave oxidation refining oxidation reforming Oxidation Remnant Coating oxidation removal Oxidation removal of sulfur Oxidation residue oxidation resisitance oxidationresistance oxidation resistance oxidation-resistance oxidation resistance at high temperature oxidation resistance at high-temperature oxidation-resistance coating oxidation resistance coatings oxidation resistance function oxidation-resistance in high-temperature oxidation resistance properties oxidation resistance property oxidationresistant