They expressed cautious optimism about a solution to the crisis.

他们对解决危机持谨慎的乐观态度。

She has grounds for cautious optimism.

她有理由可以持谨慎的乐观态度。

Cautious optimism in the fight against malaria.

持谨慎乐观的态度抗击疟疾。

The overall mood is one of cautious optimism.

从总体上看，可以持谨慎乐观的态度。

The United States expressed cautious optimism.

美国则表示情势并不太乐观。