然而，古代巨型水杉木的树身可以长到直径30英尺——即使最长的年轮取芯工具(长度只有3英尺)也无法顺利取样。

However, ancient giant sequoias can have trunks that are 30 feet in diameter — far too big to be sampled using even the longest coring tools, which are only three feet long.

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钻机配有一个主卷扬机、一个副卷扬机。主卷扬机用于升降钻具、下井管等。副卷扬机用于更换钻杆或其他取芯工具及提砂筒，也可用于洗井作业。

Vice hoist for the replacement of the drill pipe or other tools and put sand core tube can also be used for flushing operations.

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