pattern drill 句型练习 ; 模式练习 ; 句型操练
Drill Down Pattern 直接获取模式
drill string motion pattern 钻柱运动方式
set pattern drill 套路演练
But he believes more cores are needed from different regions, and is proposing to drill in other parts of the Arctic, notably areas north of Russia and east Asia, to establish the global pattern.
BBC: Coal's toxic legacy to the Arctic
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