up-back drill 半场前后练习
back geared upright drill press 带齿轮立式钻床
Back chain drill 从后往前连锁操练
back well drill 反井钻机
Ian: "One important thing to remember when you doing this fly kick on your back drill is to have the correct range of motion."
伊恩：“做仰蝶打腿练习时最重要的是要保持正确的动作幅度。”
He hopes to drill cores that date back thousands of years at the Chukchi Sea margin, providing a detailed history of interaction between oceanic currents and ice.
他希望，在楚科奇海域能钻探出几千年前的岩心，为了解海洋水流和冰之间相互作用提供详实的历史资料。
"The drill hole is just a pinprick on an elephant's back," he said.
“钻井对于整个岩浆体来说只不过是大象背上的一个小针孔。”马施说。
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