without day

• adj. 不定期(无限期)

例句

用作形容词 (adj.)

1. They always report back on their work without day.
   他们总是不定期地汇报工作。
2. If you fail to oil the engine regularly,it could seize up without warning.
   如果你不定期给机器加油，它随时可能停止运转。