但当没有发现它抛出异常。
But when there is no result found it throws Exception.
youdao
不要把它抛出去。
Don't throw it out.
否则，它应抛出异常。
Otherwise, it should throw an exception.
虽然它确实不会叼回抛出去的网球，但它可是一只先进的机器狗。
It's actually an advanced piece of robotics that won't fetch a tennis ball.
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