Can you hold your arms STRAIGHT above your eyes... or do you have to hold them at a 45-degree Angle to keep your head above water?
你能把双臂直立上举到你的眼前吗,或者你是否只能把双臂上举至和头呈45度状?
That's about how high an object would have to be orbiting straight up from the equator to constantly remain directly above the exact same spot on the rotating planet Earth.
这大约是一个物体从赤道沿轨道垂直向上运行的高度,这样它就可以一直保持在地球同一地点的正上方。
The top layer of soil is a different color. Scrape it away and make straight lines, which are easy to spot from above.
Dill告诉我们,土的上层和底下的颜色是不同的,把上层的土挖掉,呈现出一条颜色相异的直线壕沟便于人们从上空发现你。
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