Non-surgical operation therapy can contract the volume of osteosarcoma before the operation so as to acquire a more safe edge of surgical operation.

非手术治疗在一定程度上可以在术前缩小骨肉瘤体积，从而获得较为安全的手术切除边缘。

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Shuttleworth: We're just starting to see the first private vehicles being certified as safe for flight, carrying passengers to the edge of space and back.

CNN: Next challenge for space industry

Wright-Phillips made the game safe for Chelsea with a powerful shot from the edge of the box after some fine work from Joe Cole, who looked sharp throughout.

BBC: Chelsea 2-0 Tottenham

The 22-year-old made it safe in first-half injury-time when he did well to turn on the edge of the penalty area and slide a low shot past the despairing dive of goalkeeper Zeng Cheng.

CNN: STORY HIGHLIGHTS