shì miàn shàng / chū xiàn / le / bù shǎo / jiǎ mào / de / wēi ér gāng / xiāo fèi zhě / gòu mǎi / shí / yào / tè bié / xiǎo xīn

市面上出现了不少假冒的威而钢，消费者购买时要特别小心。

There have been many counterfeit Viagra on the market; consumers should be especially careful when buying.