??????

2017???????????????????????????????? ???????? ????????????????~ YY???80663099.??????????

??????????????ISO9001:2015??????????ISO9001:2008????ISO9001:2015?????????????????????????????????????????????????????????????????????????ISO9001????????????????????????????????????...

?????????????????????????????…???????????

OL

The only radio show which focus tech disruptive innovations from young people in China .

??????

????A simple dialogue which takes place in a restaurant. It is a good idea to listen many times to each part. This story is available in all languages at LingQ. You can use these...

&leelsa8182

??????