| 释义 |
DEFINITIVE EXAMPLES 权威例句〔bulge〕To cause to curve outward.使向外膨胀美国传统〔planetary nebula〕A nebula, such as the Ring Nebula, consisting of a hot, blue-white, central star surrounded by an envelope of expanding gas.行星状星云：由一颗炽热的、蓝白色的中心恒星和包围它的一层向外膨胀的气体组成的星云，如环状星云美国传统 |