arid tract的用法和樣例：
例句
- The irrigation projects are closely related to agriculture in arid oases.
乾旱區綠洲灌溉水利工程與農業發展有著極為密切的關係。 - The paper proposed a research method considering EWR of the river corridor as EWR of the natural oasis and thus developed an EWR model for arid areas.
提出了以河流廊道的生態需水作為天然綠洲生態需水的研究方法，以此建立了乾旱區生態需水模型。
