1. The Prussians are drilling in the meadow behind the sawmill.
    普鲁士士兵在锯木厂后边草地上操练

2. The air was so warm and bright, and I could hear the blackbirds whistling on the edge of the woods, and the Prussians drilling in the meadows behind the sawmill.
    天气多么暖和，多么晴朗呀！林边树梢上画眉在吟唱，锯木厂后面的草坪上传来普鲁士军人操练的声音。

3. I could hear birds whistling at the edge of the woods, and the Prussians drilling in the meadow behind the sawmill.
    我可以听到鸟儿在树林边的叫声和普鲁士士兵在锯木厂后边草地上操练的声音.

4. I could hear birds whistling at the edge of the woods, and the Prussians drilling in the meadow behind the sawmill.
    我可以听到鸟儿在树林边的叫声和普鲁士士兵在锯木厂后边草地上操练的声音.