And since they're placed irregularly on an oblong shape, one researcher compared tracking the comet to trying to hit a knuckleball.

而且因为它们是被不规则地放置在一个长方椭圆形状上的，一个研究员尝试了追踪彗星或是试图击中一个节点两种方法。

Brazilian shrub having twice-pinnate leaves and small spicate flowers followed by flat or irregularly torulose pods; sometimes placed in genus Piptadenia.

巴西的灌木，有两倍羽状的叶子和小的有穗的花，有平的不规则的豆荚；有时被归为南美豆属。

Other galaxies are placed irregularly in space.

其它星系不规则地位于太空中。