with careful pruning
细心修剪
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Careful pruning at the right time is the secret of success with roses.
养玫瑰花的秘诀就是适时细心修剪。
youdao
But they do need to be careful not to wound themselves with chainsaws or other pruning tools.
VOA: special.2009.10.06
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