只有四个姿势被发现在不借助“辅助器械”下可能实现。另外六个需要借助特殊的弹性带和同一端开口的睡袋一样的可膨胀的管道。

Only four positions were found possible without "mechanical assistance". The other six needed a special elastic belt and inflatable tunnel, like an open-ended sleeping bag.

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只有军火商会才会开口说服美国增加军费开支。

Only arms merchants would say that to persuade the US to raise military spending.

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通过一条小人行道，参观者可以看到一道长长的三米高混凝土墙，墙上只有一道开口。

Following a small footpath, the visitor first sees a long concrete wall, 3m high, with a single opening.

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