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。

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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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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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