We don't understand why, only at a specific depth, the detection of sunspots is easier.
我们还不知道为什么只在特定深度才能比较容易探测到黑子。
Wish God bless your loves than high sky of higher more lengthways, your feeling specific depth the sea is more deeply more wide!
愿上帝祝福你们的爱比高天更高更长,你们的情比深海更深更广!
Mining in deep mine generally refers to the mining technology apoted for mining the specific depth coal that is apart from surface.
深矿井开采一般是指为开采距地表特定深度的煤炭而采取的开采技术。
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