The boy gave him a guarded look.那个男孩小心翼翼地瞧了他一眼。

The ceasefire has brought guarded optimism.停火使大家产生了审慎的乐观情绪。

a guarded response from the teaching unions来自教师工会的谨慎回应

the heavily guarded headquarters of the new government戒备森严的新政府总部

Such information is among the industry's most closely guarded secrets.这样的信息属于行业中严格保守的机密。

He was hoping to keep the visit a closely guarded secret.他一直希望对这次访问秘而不宣。