我的历史教授姓斯塔布斯。

My history professor's surname is ___Stubbs.

人行道上到处是烟头，他小心地避开。

The sidewalk was littered with ___stubs, and he carefully avoided them.

那个矮胖的男人被朋友们亲切地称为“小树桩”。

The short, thick man was affectionately called '___Stubbs' by his friends.