materialityn.物质性；实质性，重要性；有形物materialn.材料；原料；素材；资料；题材；物质adj.物质的；重要的；关键的；肉体上的；实质性的material disadvantage子力不利material productivity物质生产力material guide device导料装置material acceleration物质加速度material class number材料编码,材料类别号码material civilization物质文明material Epicureanism物质享受material mobilization物质动员Material Storage Area物资贮存区material debris chute残渣滑槽

1. Keep track of the time you actually travel.
   把你旅行的实际时间记录下来。
2. Light is the most potent cue for keeping the biological clock in synch with solar time.
   光是维持生物钟与外界环境实际时间同步的最主要的信号。