这对雄海狸来说可不是好事，因为没有了白杨树它们无法在河溪里筑坝。
And that was a problem for Johnny beaver, because without the aspens he couldn't dam the rivers and streams.
他们乘一只摆渡船过了河，默不作声地骑了一大段路，那时候，暮色慢慢地落在白杨树的后面了。
They crossed the river by a ferry, and rode long time in silence, while the twilight slowly fell behind the aspens.
在沂沭河两岸河阶地上，进行了杨树套栽高产值水土保持林杞柳试验。
On the Yishu terrace, the trial of poplars interplanting high-output-value and soil and water conservation Salix interior was conducted.
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