1、
2、
As the tree enters the mature phase and reaches its full size the vigour of growth decreases.
随着植株进入成龄期，树冠形式已经完成，生长势力随之减弱。
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3、
Summer pruning devitalises the tree on an extent and consequently reduces excessive vigour.
夏剪能在一定程度上减弱植株的生命力,从而削弱过分的生长势.
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