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 。
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。
youdao
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。
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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