In spite of this , our securities firms couldrit follow the way which foreign investment bankings going for the reasons of different sving environment and their own situation , they should differentiate their way with their own features and adapt to ther environment in order to resolve the problem , the author did some research by using mathematical to tackle how to choose target market arid howtochciose the right entyrrxdd and when they should entry the foreign market then the author analyzing the risk which multinalional securities companies may encounter , including market risk , credit risk , operation risk and liquidity risk etc . by using var , the authcirfourrilrb way to manage risk arxlpreve risk . in addition to this , the author used z mode as risk forewarning in ultramarine agency 由于所处环境、自身条件等与国外投行有着极大的差别，注定国内券商不能照搬国外同行的经验，而应是在借鉴基础上走适合自己的特色道路。为此，笔者从我国券商的实际现实条件出发，采用数学方法，对我国券商跨国经营的目标国家市场的选择、国际市场进入方式的选择模型及市场进入时机进行了理论上的初步探讨，希望对国内券商的国际化有所帮助。接下来，笔者分析了券商国际化将面临的风险，将var技术应用于风险的度量、采用z模型对券商国际化的风险进行预警，并对风险防范方面提出了一些建议。
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And it was in fact the firm of tiffanys that introduced the stone to the public in a spectacular promotional campaign two years after it had been discovered . spectacular and magnificent is the deep blue of tanzanite , ranging from ultramarine to a light purplish blue . the most coveted colour is a blue which shows a purplish hue shimmering around it , which is extremely spectacular in sizes above ten carats 1967年，英国成立了泰芬尼宝石公司，该公司注意到坦桑尼亚的蓝色黝帘石是可以开发的宝石资源，随刻意开采，并融入先进的宝石加工工艺，他们把琢磨出的蓝色宝石取名为“坦桑石” ，推荐到世界宝石市场，立刻身价倍增，供不应求，丑小鸭变成金凤凰，现已成为世界流行的一种饰用宝石。
