出租车在繁忙的街道上大声按喇叭。

___Taxis honk loudly in the busy street.

细菌的趋化性使它们向营养物质移动。

Bacteria exhibit positive ___taxis by moving toward nutrients.

蝴蝶翅膀上鳞片的纹理呈现出完美的对称性。

The ___taxes of scales on the butterfly's wings show perfect symmetry.