Both countries have often toyed with the idea of an exchange of ambassadors.两国已多次考虑互换大使一事，只是从不当真。You don't take anything seriously, do you? It's all one big joke to you.你拿什么事都不当真，是吗？对你来说，什么都是儿戏。They've dallied with the idea of touring round the world.他们也想过要环游世界，但并不当真。