The development of frequency combs has revolutionized the field of precision spectroscopy. On one hand, it can directly link optical frequencies with radio frequencies, and can enable precise frequency measurement with up to 17-digit accuracy. On the other hand, it can be used to directly excite the atomic transitions and generate a new subject named direct frequency comb spectroscopy (DFCS). Ampli fi cation of the pulsed output and nonlinear processes such as wavelength conversion of frequency combs are very desirable in DFCS. However, the accuracy and resolution are often limited during the amplification and harmonic conversion. A significant progress of laser spectroscopy named Ramsey-comb spectroscopy is reported, presenting a potential solution to achieve precise measurement by combining two Nobel Prize ideas.