This is single arm drill elementary starting up with a good stream line position. left arm moving? And you notice Lindsay keeps a good line looking at the bottom of the pool.

这是基本单臂划水训练，起始时就有很好的流线形。左臂移动？，保持好的流线，注视池底。

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When a drill string moves upward or downward in a well, significant stress variations at the suspension point are caused by the starting and stopping of the motion.

钻柱在上提、下放的开始和终了悬点的应力要发生很大变化，其中以上提过程的终了时变化最大。悬点的应力变化产生速度波和应力波沿钻杆向下传递。

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Using a hollow tube, they drill into the tree and extract a 5-mm wide cylinder that shows each ring starting with the most recent, just under the bark.

VOA: standard.2010.04.05

Territorial Army units around Scotland will hold their re-badging ceremonies at drill nights starting from Tuesday.

BBC: NEWS | UK | Scotland | Army regiments merger goes ahead

The starting point for this drill is a Kremlin proposal for a " Global Monitoring System " (or GMS).

CENTERFORSECURITYPOLICY: Clinton's October Surprise(s)

Google News is starting to allow a tremendous amount of personalization features and the ability to drill down into sources you like and sources you don't, and eliminate sources you don't like.

FORBES: Magazine Article