Traveling ______ water is an interesting way to get around. So let’s get a boat! 水上航行是很有意思的旅行方式。我們去租艘船吧！
It’s really noisy here. How can you talk about business ______ a restaurant like this? 這裡真的很吵。你們怎麼有辦法在像這樣的餐廳裡談生意？
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