Sometimes it is: the bowand arrow, the spinning jenny and the computer were all adopted because theyallowed extraordinary gains in productivity.
有时候是这样：弓箭、珍妮纺纱机、计算机的使用是因为他们带来非凡的生产力优势。
Lena Jenny, 17, a high school senior in Cupertino, Calif. , said texting was so quick that "I sometimes have an answer before I even shut my phone."
加州库珀提诺的17岁高三学生Lena Jenny说，短信的速度快到“有时我手机还没收起来就接到回复了。”
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