zhè / zhǒng / shuō / fǎ / zài / háng / yè / nèi / shí / yǒu / suǒ / wén / dàn / yī / zhí / méi / yǒu / què / záo / de / zhèng / jù

这种说法在行业内时有所闻，但一直没有确凿的证据。

This claim is heard from time to time in the industry, but there has never been conclusive evidence.