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There are two reasons for guarded optimism , though .

然而，有两个理由使人们可以持谨慎的乐观态度。

The summit gave reasons for guarded optimism .

人们对峰会有理由保持谨慎的乐观。

In china 's guarded political language , that was a stinger .

这在中国谨慎的政治言论中是很严重的了。

Back to the u.s. situation : my guarded optimism should not be taken as a statement that all is well .

回头来说美国的形势：我谨慎的观态度不应视为一项一切都好的声明。

Central bankers must decide whether to shed their past preference for guarded action and sweep to the rescue with a major bond-buying program .

欧洲的各位央行行长必须做出决定，是否应该抛弃过去推崇的那种谨慎的做法，迅速推出大型债券购买计划以拯救欧元区。