Nhìn vào màu sắc. Lưu ý đến kích thước. Quan sát phần ngực tròn. Nhìn vào râu và eo.

Given the above summary, write a detailed text in English for it.
Carpenter ants are usually brown or black. Some are a combination of black and orange. While  you need more than color to figure out if you have carpenter ants, noting color is a good place to start. As you observe ants, try estimate their size. Carpenter ants are not very big. Normally, you will see worker ants around your home. They are generally 3/8 to 1/2 an inch. However, in some areas carpenter ants tend to be smaller. In Minnesota, for example, some carpenter ants are only 3/16 of an inch. When noting size, look to other characteristic as well. The thorax refers to the segment of an ant just below its head. Carpenter ants have a rounded thorax. The upper surface should be evenly rounded throughout. The midsection of a carpenter ant should be pinched and slim in appearance. Their antennae will be bent slightly. Noting the antennae and waist helps distinguish carpenter ants from termites. Termites have straight antenna and a broad waist.