Last year saw a string of incidents involving carcinogens found in Chinese food, from the industrial dye Sudan Red in salted duck eggs to formaldehyde in sheets of tofu.

• 去年发生了一系列涉及在中国食品中发现致癌物质的事件，从咸鸭蛋里的工业染料苏丹红，到豆腐里含有甲醛等。