?踮脚

...only ... on time按时，准时；以分期付... on tiptoe踮脚；切望；踮脚尖；... on top of在…上边； 在…上方...

?翘首以待

... on the spur of the moment临时激昂 on tiptoe翘首以待 The on-looker sees most of the game.不雅看者清 ...

?用脚趾走

... 你眼睛睁着. keep your eyes open / with your eyes open 用脚趾走 on tiptoe 没有闪电 without lightning ...

?蹑手蹑脚

... 忍无可忍 can no longer put up with 蹑手蹑脚 on tiptoe 不得而知 remain unknown ...