And this had not gone unnoticed... 这也没有逃过…
yet their labours go almost entirely unnoticed. 但它们的辛苦劳作几乎难以察觉
Sneaking up unnoticed is impossible. 出其不意的偷袭很难奏效
This odd assembly of vegetarians doesn't go unnoticed. 这些食草动物组成的奇特群落当然会引起注意