Oyster智慧卡采用的是Mifare Classic晶片组，而该晶片组的安全防护「完全无效(completely ineffectual)。Mifare晶片也同样用在台北捷运悠游卡和荷兰OV-Chipkaart卡。
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completely ineffectual
完全无效
以上为机器翻译结果，长、整句建议使用 人工翻译 。
That line of reasoning is weak... and completely ineffectual.
那种论证太无力了……而且完全无法成立。
youdao
From a practical standpoint, chindogus are (almost) completely ineffectual.
从实用角度来说，珍道具几乎完全没什么用。
The prosecution said scientific tests showed the devices to be completely ineffectual and lacking any grounding in science.
BBC: Fake bomb detectors sold by businessman, court told
In that case, financial disincentives are likely to prove completely ineffectual.
CENTERFORSECURITYPOLICY: Warfare's new financial face
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