Is it possible to enjoy a peaceful life in a world that is increasingly challenged by threats and uncertainties from wars, terrorism, economic crises and a widespread outbreak of infectious diseases?
2016年6月四級(jí)真題（第二套）閱讀 Section B
柯林斯高階英漢雙解學(xué)習(xí)詞典釋義
N-VAR
不確定；猶疑
Uncertainty is a state of doubt about the future or about what is the right thing to do.