开源安全是复杂难题，部分原因在于它实则是多个问题（技术性与社会性交织）的集合体。我们已阐述应对该问题的多项技术方案，但本文远非完整清单。这也不是静态清单：攻击者是安全流程中的动态参与者，防御措施必然随其技术演变而持续进化。
此前《华尔街日报》报道称，特朗普可能以撤军方式惩罚部分北约成员国。
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The first harmonic is the string vibrating along its entire length, otherwise known as the fundamental frequency. When we say that your C string is vibrating at 1 Hz, that really means that its fundamental has a frequency of 1 Hz. The other harmonics all have other frequencies, and we’ll get to those, but the fundamental is usually the loudest harmonic, and it’s usually the only one you’re aware of hearing.