在国际防扩散形势面临新变化、新挑战的背景下，召开这样的会议是十分及时与必要的。
The issues addressed by this conference are all the more topical as we face new changes and challenges in the international non-proliferation situation.
背景：甲状腺外扩散是决定甲状腺手术范围的重要因素。
Background: Extrathyroidal extension is an important factor to determine the extent of thyroid surgery.
本文从衍射波扩散出发，提出了另一种分析离轴型全息图再现象与背景光分离条件的方法。
In this paper, Based on diffracted wave diffusion theory another analysis method about the condition keeping reconstructed image separate from backdrop light for off axis hologram is given.
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