leaves of oak 栎属树叶
They found that on tannin-rich oak leaves, the virus is considerably less effective at killing caterpillars than when it is on aspen leaves, which are lower in phenols.
他们发现,在富含单宁酸的橡树叶上,病毒杀死毛虫的效果要比在白杨树叶子上的效果差得多,因为白杨树叶子的酚含量较低。
Oak leaves turn brown but stay on the trees.
橡树的叶子变成棕黄色,但仍然留在树上。
You can use mulch made from bark, pine needles, cottonseed or oak leaves.
你可以使用由树皮、松针、棉籽或橡树叶制成的根护物。
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