1. Historians have long been puzzled by dots, lines and symbols which have been engraved on walls, bones, and the ivory tusks of mammoths.
    长期以来，历史学家一直对雕刻在墙壁上、骨头上、古代长毛象的象牙上的点、线和形形色色的符号感到困惑不解。

2. Have the proper tools to turn off gas and water lines if necessary.
    有必要的话，准备一些能关闭煤气和自来水管道的特制工具。

3. And businesses eager for reliable service are willing to accept a significantly higher price tag for a wireless call — the fee is typically two to four times as much as for calls made over fixed lines.
    而且，急切想得到可靠服务的企业乐于花费可观的高价来换取无线电话--通常是固定线路电话资费的二至四倍。

4. Despite a per person income of just $220 a year, all of the 300,000 lines Vietnam plans to add annually will be optical fiber with digital switching, rather than cheaper systems that send electrons over copper wires.
    尽管越南人均年收入只有220美元，它计划每年增加的30万条线路将全部为有数字转换的光纤电缆，而不是那些以铜线传送电子信号的廉价系统。

5. As for the customer, the most dramatic change is the way checkout lines keep moving.
    从顾客来讲，最大的变化则是在付款处排队的人流不断向前移动。

6. Along rivers, under power lines, near ditches and highways -- these are the spaces that no one uses and they are everywhere.
    河边、输电线下面、靠近沟渠和公路的地方都是没人要的地。而且到处都有这类地块。

7. All lines of communication were cut off.
    所有的联系都被切断了。

8. And it isn't that easy to call or fax from the office: the waiting list for phone lines has from one to two million names on it.
    而且在泰国，从办公室往外打电话或发传真并不那么容易：待装电话的名单上有一、二百万个名字。

9. A new arrival on the anti-wrinkle front claims to be a more natural way to avoid those terrible lines.
    抗皱行列的一个新产品声称可以用一种更自然的方法来避免讨厌的皱纹。

10. She knew she had to have patience and keep the lines of communication with her daughter open.
    她知道自己得有耐心，得保持自己和桑迪之间沟通的渠道畅通。