careful observation的用法和樣例：
例句
- The most careful observation of one developing caterpillar will not help us to predict its transformation into a butterfly.
對一個正在成長的蠍子進行最仔細的觀察也不能使我們預見它變成蝴蝶。 - Careful observation of such leaf lamina shows that veins do branch and converge in places, especially near the base and apex of the blade.
仔細的觀察表明葉脈在某些地方分支和聯合，尤其在葉片的頂端和基部。
