我姐姐和我一直梦想要沿湄公河从源头到终点骑车旅行。

My sister and I have dreamed about cycling along the Mekong River from where it begins to where it ends.

当你想到使用人力的交通工具时也许会感到胆怯，但曾经骑车旅行过的人认为这是最好的旅行方式。

It may be daunting to wrap your head around the idea of powering your own transportation, but those who have done it before call it the best way to travel.

首先想到沿着整条湄公河从源头到终点骑车旅行的是我姐姐。

The entire Mekong River from where it begins to where it ends.