Too many columns in a table can make the scan time for queries much longer than if there are just a few columns.

一个表中有太多列比仅有一些列时进行查询所需的扫描时间要长。

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Conclusion: in 3d-flash sequences, water excitation technique as an alternative to fat suppression can shorten scan time significantly, without decreasing image quality.

结论：3d - FLASH序列合用水激发技术代替脂肪抑制可显著缩短扫描时间，而不降低图像质量。

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The quick scan time and narrow probe head tip, also offer the possibility for a full body scan of multiple suspicious lesions in a single patient appointment.

FORBES: Early detection is your best defense.

You can get a one-time scan of most ports free, and more thorough scans for a sliding fee.

CNN: Symantec offers Web-based PC checkups

Crist said he hopes to have all the state's touch-screen machines replaced by optical scan systems in time for next year's presidential election.

NPR: Florida Move Would Back Up Electronic Voting