那就是，当然，蒙娜丽莎这部作品要达到我们怀疑有“笑”的效果（但没人敢确定是不是真的是笑）要很多很多年，，当近距离直视这部作品的时候又看不出她的笑容。
That is, of course it takes many, many years for a woman to cultivate a smile that one suspects is there, but one can't be sure of, and which certainly disappears when scrutinised head on.
投影仪采用几何设计原理，允许操作员近距离分析材料而不会影响皮料的投影效果。
The projector is of the Geometric Design, which allows the operators to stand by closely but still guaranties the excellent projection effect.
结论放射性粒子近距离治疗各种肿瘤效果明显，为一种新的微创治疗肿瘤的手段。
Conclusion the radioactive particle implantation in tumor brachytherapy is a new, effective and minimally invasive therapy.
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