BL is an essential document in international trade and shipment.

提货单是国际贸易和船运中一种很重要的单据。

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Once at your destination, you find that the stress has made you forget an essential document.

可是等到了目的地，你发现找不到钥匙的压力迫使你忘带了一个必须的文件。

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The method utilize file head and essential document information to obtain Bitmap message, and then transform from GPR data to Bitmap, at last attain to the display of GPR data.

该方法利用文件头和必要的文件信息生成位图信息，然后完成GPR数据到位图数据的变换，最后通过位图的显示来完成GPR数据的显示。

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And most of that space goes for essential apps like various mail, sms, document management, file management, mapping applications etc leaving little space for apps.

FORBES: Unhappy With Slow Growth Of Android App Purchases, Google Talks 2011 Roadmap

However, many liberals say it is an outdated document because it leaves out functions of government they now believe are essential.

FORBES: Should We Starve the Beast?

And its current plan of action for 2011-14, a 41, 000-word document, includes no mention of schizophrenia, bipolar disorder or outpatient commitment, all essential elements in an effective plan for corrective action.

WSJ: E. Fuller Torrey: Fifty Years of Failing America's Mentally Ill