A means the same thing as the English words under the Chinese definition
B means it usually sleeps for 15 minutes at night
C he goes to bed at 10:15 at night
D means he usually goes to be at 10:15 at night
In sign language, facial expressions are used to express both linguistic information and emotions. For example: eyebrow raise is necessary to mark general questions in most sign languages. At the same time, signers use the face to express emotions – either their own, or when quoting someone else.
ingularity is referred to a quantity, which approaches infinity as another parameter goes to zero. An example is a black hole, in which a very large mass gets concentrated in so short a distance that gravitational forces become infinite and all matter and energy (including light or electromagnetic energy) cannot escape it. At this level all physical laws break down.
A quasar is a point-like source that is associated with radiatively efficient emission of an active galaxy, which means that its central black hole and is undergoing high rates of mass accretion. They are typically among the most distant objects we can observe and have highest red shifts and thus on the fringes of universe.
