'What's today?' he cried, callingdown to a boy in the street.
“今天是什么日子?”他叫住街上的一个男孩大声地问。
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In the end, they had a version of the BSD kernel running as a process on top of their microkernel and callingdown to Mach instead of executing privileged instructions.
In a military setting this could mean passing pictures recognised as a convoy of moving vehicles to a person for confirmation before, say, callingdown an airstrike.