In the long period of time the traditional Wushu training theory has experienced approximately three phases, the creation period, the center period and the evolution period.

在岁月的长河中，传统武术训练理论大致经历了三个阶段：原创期、轴心期和沿承期。

youdao

The finance industry is in the midst of a transformative period of evolution, and financial economists have a huge agenda to tackle.

ECONOMIST: Financial economics

"Every period shows evolution in their expression, " Rainero says.

WSJ: The Sublime Cats of Cartier

Dr Hazen and his team speculate from meteorite and early rock studies that several hundred mineral species, including zircon, quartz, clay and halite salt crystals, formed during this early period of mineral evolution.

ECONOMIST: Minerals