是囿于一时一事的得失，还是着眼打基础、利长远的实绩？
Leonardo da Vinci is usually credited with conducting the first systematic study of friction in the late 15th century, a subfield now known as tribology that deals with the dynamics of interacting surfaces in relative motion. Da Vinci's notebooks depict how he pulled rows of blocks using weights and pulleys, an approach that is still used in frictional studies today, as well as examining the friction produced in screw threads, wheels, and axles. The authors of this latest paper used an experimental setup similar to da Vinci's.
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Согласно прогнозам, в субботу, 28 февраля, осадков не ожидается. При этом температура упадет до минус 18-23 градусов ночью и минус 10-15 градусов днем. В воскресенье вновь начнутся снегопады.