completely unsuccessful
完全不成功
以上为机器翻译结果，长、整句建议使用 人工翻译 。
For conifers which do not form an abscission layer at the base of the cone, shakers have been partially or completely unsuccessful.
对于球果基部不能形成脱离层的针叶树，摇树机的作用不大，或者完全不起作用。
youdao
Sometimes the hunters were completely unsuccessful in killing any of the animals.
VOA: special.2009.02.15
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