Cluster nursing (very frequent to constant nursing) for several hours—usually evenings—each day. This may coincide with the normal "fussy time" that most babies have in the early months.

连续吃奶（非常频繁到不停地吃奶）几个小时，通常在每天的晚上。这可能与大部分宝宝在最初的几个月都会有的“烦燥时间”的存在有关。

youdao

Hence it is proposed that the temperature and the density of electrons in a rich cluster and the Hubble constant H0 may be determined from the observations of the IR-background distortion.

因此，通过对畸变的观测，可以确定富星系团内电子的密度和温度以及哈勃常数h_0。

youdao

If, however, it has remained constant, the rate of cluster formation should have remained constant, too.

ECONOMIST: Cosmology

Cranes cluster like praying mantises on every horizon, and the shudder of construction work provides a constant soundtrack.

WSJ: Ancient Village Rises in Shanghai; The Shock of the Old