試水溫

to test the waters

surname Shui

water / river / liquid / beverage / additional charges or income / (of clothes) classifier for number of washes

to test / to try / experiment / examination / test

to run water through a system to test it (for leakages etc) / (fig.) to test the waters; to do (sth) on a trial basis

water temperature

surname Wen

warm / lukewarm / temperature / to warm up / mild / soft / tender / to review (a lesson etc) / fever (TCM) / old variant of 瘟[wen1]