After waiting for forty minutes, I heard some noise in the outer room.
等了40分钟后，我听到了外边房间的什么声音。
For one, nascent stars are incredibly active and their changing outer atmospheres can at the very least make for background noise.
比如，新生恒星是异常活跃的，它们不断变化的外层大气至少会导致背景噪声。
The algorithm employed ellipsoidal outer approximation of the feasible set assuming instantaneous process and observation noise vectors and the initial state to be bounded by known ellipsoids.
算法假设系统的过程和量测噪声以及初始状态由已知椭球来定界，然后利用椭球集合来描述系统真实状态的可行集。
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