These include hand collecting, using baits to attract the ants, ground litter sampling, and the use of pitfall traps.

这些包括人工收集，使用诱饵吸引蚂蚁，地面垃圾取样，以及使用陷阱诱捕。

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Don't litter the ground with paper.

勿随地乱扔纸屑。

《新英汉大辞典》

We should not throw litter onto the ground.

我们不应该把垃圾倒在了地上。

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Other fragments, most barely recognisable, litter the ground.

BBC: NEWS | Middle East | Eyewitnesses tell of Emirates crash

Human bones and trash litter the ground.

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Two great-granddaughters of Lady Elizabeth Brunner, who as head of the Women's Institute got the anti-litter movement off the ground more than half-a-century ago, will dress in clothes from the 1950s to launch the initiative.

BBC: Huge litter pick gets under way