The action stems from a federal court order issued on Tuesday requiring Apple to help the Federal Bureau of Investigation to unlock an iPhone used by one of the two attackers who killed 14 people in San Bernardino, California, in December.
2017年12月六級真題（第三套）閱讀 Section B
This inconsistency largely stems from a feeling of powerlessness.
2015年12月六級真題（第二套）閱讀 Section B
Yet once they start growing, such plants seem not to retain the ability to hit the pause button on metabolism in their stems or leaves.
2018年6月六級真題（第一套）閱讀 Section B
柯林斯高階英漢雙解學習詞典釋義
VERB
起源于;來自;由…造成
If a condition or problem stems from something, it was caused originally by that thing.