Simpler version of Stonehenge discovered 考古学家发现结构更简单的 “巨石阵”
How high temperatures affect sleep 高温对睡眠的影响
Passing ships 如擦肩而过的航船，难得相遇
“预约” 和 “预购”：英语怎么说？
How five-minute walking breaks could make you happier 每小时走五分钟，心情会更好吗？
一词一讲：tip
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