First, Chinese inheritance has a national law. But in US, 50 states (and DC) have state laws. There is no US federal inheritance law. So you have to check with your local state law.
遗嘱可以剥夺某一合法继承人的权利吗？
Yes, but in some states in US, you cannot leave your spouse with nothing.
遗嘱可以跨国有效吗？
Yes, as long as the will satisifies local legal requirement, such as who witness it, who signs it etc. Local = chinese national law and US state law.
遗嘱跨国使用需要翻译公证吗？
You at least need a translation, whether notorized or not, depends on local law.
牵涉中美二国财产的遗嘱，需要同时满足二国法律吗？
Usually, US property needs a US will satisfies local state law, and Chinese property needs a Chinese will satisfying Chinese law.
遗嘱可以剥夺某一合法继承人的权利吗？
遗嘱可以跨国有效吗？
遗嘱跨国使用需要翻译公证吗？
牵涉中美二国财产的遗嘱，需要同时满足二国法律吗？
如果回答是YES, 我的直觉遗嘱无用，除非只有美国的财产。
First, Chinese inheritance has a national law. But in US, 50 states (and DC) have state laws. There is no US federal inheritance law. So you have to check with your local state law.
遗嘱可以剥夺某一合法继承人的权利吗？
Yes, but in some states in US, you cannot leave your spouse with nothing.
遗嘱可以跨国有效吗？
Yes, as long as the will satisifies local legal requirement, such as who witness it, who signs it etc. Local = chinese national law and US state law.
遗嘱跨国使用需要翻译公证吗？
You at least need a translation, whether notorized or not, depends on local law.
牵涉中美二国财产的遗嘱，需要同时满足二国法律吗？
Usually, US property needs a US will satisfies local state law, and Chinese property needs a Chinese will satisfying Chinese law.
如果回答是YES, 我的直觉遗嘱无用，除非只有美国的财产。
Will is very important.
谢谢柠檬！还是美国人在买房子初，开账户初都可以避免这些麻烦？
国内法律是法律，执行归执行。中间弯弯绕很多。在我看来，国内遗嘱的作用不大。一但有纠纷，就且得花时间打架。在国外的没这个精力。除非兄弟姐妹和睦，即使兄弟姐妹和睦，还要看其配偶的意见。总之，兄弟姐妹越多越乱套。
中国人在美国的遗产按当地州法，美国人在中国的遗产按中国法律
你觉得在国外居住这么长时间的人会比国内的人有人脉？
你未见得就拿得到。比如房子判给你，人家住着，你卖不掉能咋办。都是亲戚，好意思彻底翻脸？哈哈。我看除了自己买的资产，遗产啥的就别琢磨了。能拿点当然好，拿不到也就拉倒吧。不值得花那个精力受那个气。