They usually collect sales tax on online purchases already.

他们通常已经对网上购物征收销售税了。

You can’t use it for online purchases, nor on many airplanes to buy snacks or duty-free goods.

现金不能用于网上购物，也几乎不能在飞机上购买小吃或免税商品。

Other transactions including, without limitation, online purchases, mail and telephone orders, other transactions without sales slip and any unauthorized transaction are not eligible for the offers.

其他交易包括但不只限于网上购物、邮购、电话购物、没有签账存根之交易及其他未经许可之签账均不适用。

Online purchases are routinely followed up by a customer satisfaction survey.

在线购买通常会进行客户满意度调查。