单词	It was a calm sea
释义	It was a calm sea. 海上风平浪静。
随便看	direct currentd.c direct current dc direct current,dc direct current, dc direct currentDCpotential direct currentdc potential direct current deposition direct current dialing direct-current dialing direct current dialling direct current differential transformer direct-current differential transformer direct current digital voltmeter direct current diode sputtering direct-current direct-current converter direct-current discharge direct current dissipation direct current dissipationpower direct current distillation direct current distribution direct-current distribution direct current drive direct-current dump direct current dynamo direct-current dynamo