鳄梨树根腐病的感染用视觉是无法探测出来的。
The infestation of avocado root rot disease is not visually detectable.
前院里长了一棵梨树，树根都快被积雨泡烂了，就因为那好几年院里连一棵草都没长——更谈不上什么草坪了——雨水总是锁不住。
There was a pear tree in the front yard which was heavily eroded by rain from years of not having any lawn.
前院里长了一棵梨树，树根都快被积雨泡烂了，就因为那好几年院里连一棵草都没长——更谈不上什么草坪了——雨水总是锁不住。
There was a pear tree in the front yard which was heavily eroded by rain from years of not having any lawn.
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