Navigation in ancient Rome did not rely on sophisticated instruments such as compasses but on experience, local knowledge and observation of natural phenomena.

古罗马并不依靠罗盘等精密仪器，而是依靠经验、当地知识和对自然现象观察。

A quarter of respondents to a survey in America aren't keen to try precision-fermented fare, which may explain why producers prefer to call it animal-free.

国一项调查显示， 四分之一受访者并不热衷于尝试精密发酵食品，这或许可以解么生产商更愿意称其“无动物成分” 。