covered with a substance that does not let heat, electricity, or sound to enter or escape through it
绝缘的
capable of providing everything that one needs, particularly food, without any help from others
自给自足
a type of wave that travels through a medium like air or water and carries sound from one place to another
声波
an enclosed structure built among the branches of a tree to provide children with a place to play in
树屋
a type of recreational vehicle that is designed for long-distance travel and can function as a temporary home on wheels
房车
a set of stairs inside a building including its surrounding side parts that one can hold on to
楼梯
a device that plays content such as movies or shows from flat discs called DVDs on your TV or other display
DVD播放机
a cellular phone or cell phone; a phone without any wires and with access to a cellular radio system that we can carry with us and use anywhere
手机
a container, typically made of glass or acrylic, used for keeping and displaying fish and other aquatic animals
鱼缸