contextvars.po

註： effective 的翻法:
因為英文中 effective 不一定是指有效的，有時是 in effect 或甚至 in fact 的意思

#: ../../library/contextvars.rst:147
Each thread has its own "effective" stack of :class:!Context objects. The :term:current context is the :class:!Context object at the top of the current thread's stack. All :class:!Context objects in the stacks are considered to beentered.
這裡翻成「目前執行緒堆疊頂端的」是因為這個 effective stack 並不是專有名詞，他就是指實際上正在主控的那個 stack

#: ../../library/contextvars.rst:170
Exiting a context "effectively" reverts any changes made to context variables while the context was entered (if needed, the values can be restored by re-entering the context).
這裡的 effectively 也不是有效的，而是「實際上的效果是」的意思