例句與造句

1. At the same time, he was research director of CNRS . Among others, he worked on elastic waves in gravitational radiation detectors, shells of matter and their gravitational collapse, the Newman " Penrose formalism and its identities, stationary axially symmetric gravitational fields, and gravitational and electromagnetic radiation fields.
2. It's difficult to find axially symmetric gravitational field in a sentence. 用axially symmetric gravitational field造句挺難的