求翻译：没有比较，就显不出长处；没有欣赏的人，乌鸦的歌声也就和云雀一样。要是夜莺在白天杂在聒噪里歌唱，人家绝不以为它比鹪鹩唱得更美。多少事情因为逢到有利的环境，才能达到尽善的境界，博得一声恰当的赞赏。是什么意思？

There is no comparison, not merits; people who did not appreciate, as Crow's song and lark. If mixed with the noisy during the day the Nightingale Sings, people never thought it was more beautiful than Wren singing. How many things because every favourable environment in order to achieve the best of world of good, winning a proper appreciation.