1.a series of 一系列的

The deal ended after a series of rancorous disputes.

经过一连串充满敌意的争吵，该交易泡汤了F2M5PsP=ZX@EJvOMs。

2.galactic center 银河系中心

Regions of the galaxy that are rich in heavy elements generally, such as the galactic center, have higher carbon-to-oxygen ratios.

在宇宙里一些含有大量重元素的地区如银河系中心里，一般都有较高的碳氧比例;U=#4M,,1t8j2M。

3.hierarchy 层级，等级制度

Like most other American companies with a rigid hierarchy, workers and managers had strictly defined duties.

像大多数其他等级制度森严的美国公司一样，工人和管理人员都有严格界定的职责OQ[|m^V.OgJ.。

4.absentee 缺席者

He has already voted by absentee ballot.

他已经通过缺席投票的方式投了票bri93e]7~[5!kb1lYl。