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1. Достаточно близко чтобы слышать голос друг друга.
When the two ships were within hail, their officers exchanged messages.
Billy's mother told him to stay within call because supper was nearly ready.
2. Быть там, где с вами можно связаться по телефону, в пределах досягаемости радио или телевидения.
The sick man was very low and the doctor stayed within call.
The soldiers were allowed to leave the base by day, but had to stay within call.