Many pieces that fail to achieve their reserve price at auction are quietly sold afterwards in “private-treaty” deals negotiated by the auction houses.

许多在拍卖行无法卖出其最低价格的艺术品，之后便会在台下悄悄地按照“私人协定”交易来完成，拍卖行则会充当协商方。

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Inevitably with old pieces of equipment they are more likely to fail but it would be premature to speculate on the cause of the crash.

BBC: Crash scene