「背景附件（background-attachment），用于控制背景图像是否会随页面的滚动而一起滚动。有固定（fixd，文字滚动 时，背景图像保质固定）和滚动（scroll，背景图像随文...
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背景图像取自名为gradblue10 . j pg的文档的附件。
The background image is taken from an attachment to a document called gradblue10.jpg.
背景知识：在全膝关节成形术中，计算机辅助的外科导航技术是否可以改善肢体及其附件的对线是大家争论的焦点。
Background: Whether total knee arthroplasty with use of computer-assisted surgical navigation can improve the limb and component alignment is a matter of debate.
该装置由离轴抛物面反射镜、十字靶标、背景光源、图像采集装置及其它附件组成。
The system is composed of off-axle paraboloid reflector, cross line target, background light, imaging collecting system and other devices.
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