You need to know whether the toy can be used on hard surface only or both hard surface and grasses.
你需要知道的玩具可用于硬表面的唯一或硬表面和草。
Because of the lack of soil, water, fertilize and hard ecological conditions in rock slope, there are lots of difficulties when planting trees or grasses on the slope.
由于岩石边坡缺土、缺水、缺肥,生态条件十分恶劣,因此在岩石边坡上栽树、种草的难度相当大。
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