The parrots were given the intellectually demanding task of pulling a snack on a string up to their beaks, using a co-ordinated combination of claws and beak.

鹦鹉们被分派了一项对智力要求很高的任务，它们要协调爪子和喙，将一份拴在绳子上的零食拉到它们的喙上。

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And so one string must be pulling in this direction and the other string must be pulling in this direction so that the net force on the system is zero.

因此一条细绳施加一个拉力，朝这个方向，另一条细绳也必然施加拉力，朝这个方向，这样整个整体合力为零。

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From this output we can see that our mediation was called and successfully inspected the incoming message, pulling out the operation details and the string value that we passed in.

通过这个输出，我们可以了解到已调用了中介，并成功地检查了传入消息，同时提取出了操作详细信息和我们传入的字符串值。

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"We are going to keep pulling this string and see where it takes us, " he said.

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As soon as Antonveneta's board had accepted it, BPI stepped in, pulling every available string to thwart the Dutch.

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Norwich keeper Rob Green played a major part in keeping them on level terms in the first half, with the highly-rated youngster pulling off a string of fine saves.

BBC: Norwich 2-1 Walsall