就在这时，乌鸦看到水罐旁边有块小鹅卵石，这让他想到一个主意。
Just then, the crow saw a pebble beside the pitcher and it gave him an idea.
飞行员可以在战区上空飞行，在地面上扔下数千个小型无线传感器，每个传感器只有一块小鹅卵石大小，价格为1美元。
Pilots can fly above a war zone and drop thousands of small wireless sensors, the size of a small pebble and costing a dollar apiece, over the terrain.
她孵化出了具有强侧向或弱侧向的雏鸡，然后为这两组小鸡准备了隐藏在小鹅卵石中的食物，还制造出假的掠食者飞过头顶的威胁形状。
She hatched chicks with either strong or weak lateralisation, then presented the two groups with food hidden among small pebbles and the threatening shape of a fake predator flying overhead.
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