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To muck about is an informal way to say playing with something carelessly, not for a serious reason.
1. As kids, we used to muck about for hours in the garden, just building mud forts and digging holes.小时候，我们常常在花园里瞎玩好几个小时，就是堆泥堡、挖洞。2. I couldn't get any work done at the library because the group at the next table kept mucking about and laughing loudly. 我在图书馆里完全没法工作，因为旁边那桌人一直在嬉笑打闹，吵得很。3. Don't just muck about with the settings on my camera—you might accidentally change something important! 别乱动我相机的设置——你可能会不小心改掉什么重要东西！
Word a day, speak their way!
10个月宝宝每天需要喝多少奶粉？
