... upper-level low 高空低压 upper-level ridge 高空脊 upper-level trough 高空槽 ...
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The upper level straddles across the lower parallelepiped and the mountain ridge, while being surrounded by a terrace on three of its four sides.
低两端的平行和山脊上一级跨越，在被包围的露台就其四面3。
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