引起铁壳电池加底偏心的主要原因是铁壳结构缺陷和加工误差。

Major cause of deviation of bottom added from the axis of the cell with iron can were structure imperfection of iron can and processing tolerance.

youdao

答案看起来是这样的：就因为八月底是阿拉斯加北部的北极熊游向北方的海冰的特定时段，文中这只母熊也正是这样做的。

The answer seems to be that, simply, late August is the period when polar bears in northern Alaska head north on to the sea ice, and that is what she was doing.

youdao

拉加德，一个和两个儿子生活在一起的单身母亲，她也谈了很多关于她的事业、她的家庭、和她所挚爱的位于鲁昂北部和诺曼底北部的乡村的衰退。

Ms Lagarde, a divorcee with two sons, also spoke a little of her career, her family and her beloved country retreat, north of Rouen, in upper Normandy.

youdao