channel travel isochrone chart

例句：

1. 1.The river flows through the valley, providing a natural channel for transportation.
   这条河流流经山谷，为运输提供了自然的通道。
2. 2. The engineer designed a channel to divert the floodwaters.
   工程师设计了一条渠道来转移洪水。
3. 3. The scientist used a channel to collect samples from the ocean floor.
   科学家使用了一个通道来收集海底的样本。