To strive, to seek, to find, and not to yield.
要奋斗,要探索,要有所发现,而不要屈服。
It is impossible to make more than the wildest guess at how many they kill, but they are hungry creatures, not content with only three meals a day.
它们一年中消灭了多少昆虫,我们简直无法猜测,它们是吃不饱的动物,不满意一日三餐。