arduous - involving a lot of effort and energy, especially over a period of time - ยากลำบาก, ยากเข็ญ, หนักหน่วง
Articles found:
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- Solar plane lands in Hawaii after record-breaking 5-day flight (Updated) (04/07/2015)
- Solar-powered plane lands in China (Updated) (30/03/2015)
- Divers find AirAsia bodies still in their seatbelts (22/01/2015)