动词 mull:

1. reflect deeply on a subject

2. heat with sugar and spices to make a hot drink

mullv.思索；(充分)碾碎；混合vt.加糖和香料并烫热n.麦尔纱(一种涤绵织物)n.(苏格兰)海角；岬；乱糟糟mullan.毛拉(伊斯兰教国家对老师；先生、学者的敬称)

1. I haven't decided what to do; I'm mulling it over.
   我还没有决定怎么办，我正在仔细考虑。
2. I haven't decided yet; I'm mulling it over in my mind.
   我还没有决定，一直在仔细考虑。