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Screws
螺絲釘
Because you see screws every day, every where, you may think they're not important or great.
因為你隨時隨地都能看到螺絲釘，就可能認為它們不重要或不偉大了。
But screws are very useful, important and great tools.
但螺絲釘是非常有用、重要且偉大的工具。
Screws look like nails, but they have spiral shapes on their sides unlike nails.
螺絲釘看起來像釘子，但和釘子不同，它們的側面有螺旋。
Therefore, instead of a hammer, a screwdriver is necessary to use screws.
因此，使用它時不用錘子，而用螺絲刀。
Screws are very useful to fasten parts of a machine.
螺絲釘對于固定機器零件非常有用。
Almost every machine uses screws.
幾乎每臺機器都用到螺絲釘。
People have used screws for a really long time.
人們使用螺絲釘很長時間了。
Greeks and Romans used wooden screws about 2,500 years ago.
希臘人和羅馬人從大約2500年前就開始使用木制螺絲釘了。
Now, people use various materials to make screws.
現在，人們使用各種材料來制造螺絲釘。
Stainless steel is the most common material.
不銹鋼是最常見的材料。
Plastic screws are also used for kids' toys.
塑料螺絲釘也用于兒童玩具。
