Some international calls had to be booked days in advance.

一些国际长途电话在数天前就得先预定。

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She avoids using the telephone and only answers calls that have been booked in advance so she knows who she is talking to.

她尽量不使用电话，只接听一些表明了来电者身份的电话。

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As a manager, consider establishing a regular phone meeting time. For longer phone calls, schedule the time in advance.

作为一名经理，应该习惯建立电话例会，如果会议时间比较长，最好提前通知其他人。

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Health Affairs editor Susan Dentzer says the rapid advance of information technology, along with declining prices, presents what she calls a spectacular opportunity in poor and middle-income nations.

VOA: standard.2010.02.24

Prices for customers who make few calls and pay in advance are reasonable.

ECONOMIST: Carlos Slim

Mr Obama also rejected calls to leave Afghanistan in advance of the 2014 Nato timeline, saying "we must finish the job we started in Afghanistan, and end this war responsibly".

BBC: Barack Obama pledges to 'finish the job' in Afghanistan

With wall and window units, ask in advance about the price of service calls, labor and any parts.

WSJ: Don't Wait to Service AC Units