expulsion apparatus
驱逐装置
以上为机器翻译结果，长、整句建议使用 人工翻译 。
His chemistry teacher at school was understanding, allowing him to lark around with apparatus, just within the limit of danger and expulsion, at the back of the class.
ECONOMIST: Paul Lauterbur, father of MRI, died on March 27th, aged 77
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