Armed only with a dog-eared NEWSWEEK ID, I ambled through the gates of the National Assembly last week.

上周，我带着一张折了角的《新闻周刊》ID（NEWSWEEK ID），悠闲地走进了国民大会（National Assembly）的大门。

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All the tools include principal of the drill tools, overshot assembly, drill rods, holding dog, circle wrench and etc.

整套钻具包括：钻具总成、打捞器、钻杆、绞车、提引器、夹持器及自由钳等部件。

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If the slips fail to hold the tool assembly, the dog collar will prevent the entire assembly form dropping through and being lost in the wellbore.

如果卡瓦未能固定工具组合，则爪环将会防止整个工具组合落井。

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