To begin tracing through live objects, garbage collectors start from a set of initial objects obtained from roots.

为了开始跟踪活对象，垃圾收集器从一组根中获得的初始对象开始。

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You will find that objects that are at constant initial velocity maintain the velocity.

你也会发现原本匀速的物体,依然保持原来的速度

耶鲁公开课 - 基础物理课程节选

These objects are predicted to be galaxies in their initial star-forming phase, with giant black holes at their centres.

ECONOMIST: Japan��s new telescope