It is useful to science _______ the earth as an object in space.
举一反三
- Generally speaking, there are four categories of space. They are intimate space, personal space, _______ space, and public space.
- 1) All the space trash floats in space.
- _____ is the way we use fixed space and personal space.
- Chronemics is the way we use fixed space and personal space.
- As its name suggests, a space elevator is designed to raise things into space.