器械折断于上磨牙近颊根管和下磨牙近中根管者居多，占70.7%。器械折断在根管中下段多见，占70%。

Most of which happened in mesiobuccal canal of maxillary molar and mesial canal of mandibular molar, accounting for 70.7%.

youdao

reduce 调用的结果存储在一个 B-Tree 中；数据在 B-Tree 中的位置距离根越近，汇总级别也就越高。

The results of the reduce call are stored in a B-Tree; the closer to the root the data is in the B-Tree, the higher-level the summary.

youdao

与近藤的研究相合作的林务局另外一项研究中，研究员摩根根·格鲁夫研究了巴尔的摩市中心犯罪率与草坪维护情况之间的关联。

Kondo o's study collaborates another forest service study conducted by researcher Morgan Grove on the link between lawn care and crime in downtown Baltimore.

youdao