目的 探讨寰椎椎弓根螺钉的置钉方法。 方法 以电子游标卡尺测量48具干燥寰椎标本的相关解剖学数据；
Objective To improve the method of atlas pedicle screw fixation. Methods The anatomic data related to pedicle screw fixation were measured on 48 dry atlas specimens with an electronic caliper.
为了起出钻具，钻井工人要把钻具分解成长度较短的单根或立柱。
To pull the string, the crew has to unscrew it, or break it out, into smaller lengths, or stands.
根皮层薄壁细胞中有的具共生的真菌菌丝。
In some of the parenchyma cells in cortex of root, there are clusters of symbiotic fungal hyphae.
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