今日小常识

　　Leonardo da Vinci was one of the earliest inventors to work on the concept of an artificial flipper to help swimmers. The American inventor Benjamin Franklin also made an early design from wood.

　　达芬奇是研究如何用人工脚蹼（蛙脚）来提高游泳速度这一概念的最早的发明者之一。美国的发明家弗兰克林也曾发明过木质的蛙脚。

　　英语短语 to flip out 意思是由于震惊而失控暴怒。

　　例句

　　When Kate heard that she hadn't got a place at her first choice of university she really flipped out and started shouting and screaming.

　　The flight was cancelled and lots of passengers started flipping out at the airline staff.

　　请注意

　　The flip side 是另一个意思，表示反面，特别指物体或论点的负面，不利面。

　　The Olympics is a great event; on the flip side it's very expensive to host.

编辑：张雨

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