b1u3●重点句型1．ever since middle school, my sister wang wei and i have dreamed about taking a great bike trip.从高中起，我姐姐王薇和我就一直梦想作一次伟大的自行车旅行。2．it was my sister who first had the idea to cycle along the entire mekong river from where it begins to where it ends. 首先想到要沿湄公河从源头到终点骑车旅行的是我的姐姐。3．when i told her the air would be hard to breathe and it would be very cold, she said it would be an interesting experience.当我告诉她那里空气稀薄，呼吸困难而且天气很冷时，她却说这将是一次有趣的经历。4．once she has made up her mind, nothing can change it.她一旦
