The lens is made of cell-shaped plastic which has the beautiful retractile effect.
采用蜂窝状塑胶做透镜，其表面花纹达到优美的折射效果。
2
It also states a troubleshooting analysis of the undercarriages retractile system.
还包括一次起落架收放系统的故障分析。
3
Any of numerous aquatic or terrestrial mollusks of the class Gastropoda, typically having a spirally coiled shell, broad retractile foot, and distinct head.