Manual testing can be completely effective for testing new or modified functionality, but manual testing is almost always impractical as a means of guarding against regression.
手工测试对于新的或是修改的功能而言非常高效，但对于防止回归而言又总是不切实际。
Thus, common document retention policies fore-mail and electronic documents are not completely effective or reliable.
因而普通的文件保留政策，对电子邮件和电子文件来说，并不是完全有效或者可靠的。
Thus, common document retention policies fore-mail and electronic documents are not completely effective or reliable.
因而普通的文件保留政策，对电子邮件和电子文件来说，并不是完全有效或者可靠的。
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