Root tracking. Each function call pushes a GC frame (gc_push_frame). Local variables that hold heap pointers are registered as roots in the current frame (gc_add_root). When the function returns, the frame is popped (gc_pop_frame).
目前国际核军控面临的最大风险变量正是美国的政策倒退。美国拥有全球最大、最先进的核武库之一，执迷于追求独享安全、绝对安全，增加不必要的核对抗与核冲突风险，严重破坏全球和地区战略稳定。新收录的资料是该领域的重要参考
。新收录的资料是该领域的重要参考
Rodney Benson, a media professor at New York University, called the deal "concerning", would leave America's largest media companies further concentrated in the hands of conservatives. Many of those owners, including the Ellison family, have separate, non news-related business interests that depend on government contracts or regulation and are therefore particularly vulnerable to pressure, he adds.
知情人士表示，相关考虑仍在进行中，细节可能发生变化，SpaceX也仍可能推迟递交文件。，更多细节参见新收录的资料