- 重点词汇
- 免费
free; complimentary; gratis; courtesy; be free of charge; cost free; cost a dime; cost a penny; for free; at no cost; without payment; grant free of charge
- 销售
sale; marketing; sell; do; carry; shift; merchandise
- 软件
software
- 电话
telephone; phone; the telephone; telephony; communication; telephone system; blower; buzz