这仅仅包含了三种活动，如果要算上其他的数字媒体活动的话，这个估计时长无疑会增加。
That covers just three activities, and if other digital media activities were included, that estimate would no doubt rise.
使用幻灯片或其他辅助手段会增加时长——稍微提前一点结束比延长时间要好。
Using a flip chart or other visual AIDS also adds to the time. Remember - it is better to finish slightly early than to overrun.
Ofcom同时发现，和其他因素相比，通讯资费在决定了人们通话的时长以及他们对于座机电话和移动电话的偏好上有决定性作用。
Ofcom also found that cost, more than anything, determined how long people talk for and whether they prefer a landline or a mobile call.
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