aigoo kyuhyun. you make me going sink aaaaa >.<
At first, two iron wires connected each pair of telephones. Then switchboards brought phone wires into one location. Other inventions - the vacuum tube to amplify sound, and coaxial cables to link long distances on land and under the seas -- greatly expanded phone service. Transistors replaced the old vacuum tubes, and by the 1960s communications satellites eliminated the necessity of landlines. Today, bundles of glass fibers carry calls on laser beams of light.
The elements included in your blogs are special to others, such as color, layout, pictures, templates etc. I would be very pleased if you could sell me some ads. Tell me the price if you are to sell me ads. I am looking forward to your kind reply. Thank you!