Africa and climate therefore confront the rational optimist with a challenge, to say the least.
因此，至少可以说，非洲和气候问题将使理性乐观主义者面临挑战。
Sooner or later, the ubiquitous pessimist will confront the rational optimist with his two trump CARDS: Africa and climate.
迟早，无处不在的悲观主义者将会以其手中的两张王牌来面对乐观主义者：非洲和气候问题。
Sooner or later, the ubiquitous pessimist will confront the rational optimist with his two trump CARDS: Africa and climate.
迟早，无处不在的悲观主义者将会以其手中的两张王牌来面对乐观主义者：非洲和气候问题。
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