Pushdown
推下; 后进先出方式
🗣️ 情景例句
I have a heavy class load this term.
这个学期我的功课很重。
In this flat country people grow wheat and corn and raise cattle.
在这个平原国家人种小麦和玉米并且养牛。
has spent his lifetime studying active volcanoes and deep caves in all parts of the world.
花了毕生的精力来研究世界各地的活火山和探洞。