电话活动跟踪程序。
如莫斯科的交换机活动表所示；晚上，月黑风高，打电话的人们少了很多。
Activity of Moscow switchboards shown. At night people call each other much less.
学习和使用通过打电话邀请别人外出活动的方式。
Invite the friends by phone. The teacher gives the example & The students practice.
他说这个团体在电话上与这两个活动“在整个早上。”
He said the group was on the phone with the two campaigns "throughout the morning."
活动操练：我来接电话！
活动操练：我来接电话！
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