环境的破坏是我们所面临的最严峻的挑战之一。
Destruction of the environment is one of the most serious challenges we face.
他面临迄今为止对自己的领导工作最严峻的考验。
“我想我们最希望找到一些好东西，即使是在目前最严峻的情况下。”露丝说。
"I think we'd love most to find something nice, even in the most serious situation as it is now," Ruth said.
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