2′. X {\displaystyle X} 的每點皆有相對緊(英语:relativelycompact)鄰域; 2″. X {\displaystyle X} 的每點皆有相對緊(英语:relativelycompact)鄰域組成的局部基; 3. X {\displaystyle X} 的每點皆有緊鄰域組成的局部基;
explosion 200 million light-years away - Supernovae, or exploding stars, are relatively common. But now astronomers have observed a baffling new type of cosmic
contrast, Gab users who shared more far-right "fake news" websites are relatively more visible on Gab. Some of the most cited sources under this category