比如数学，过去是人们业余时间玩的游戏。
Math, for example, used to be something a handful of people did part-time.
“我过去以为科学俨然就如数学，实在乏味，”他说。
"I thought science was just like math, really boring," he said.
某些学科，例如数学和物理，是很难学的。
Some, subjects, such as maths and physics, are very difficult to learn.
某些学科，例如数学和物理，是很难学的。
Some subjects, such as maths and physics, are very difficult to learn.
上午，我们上四节课，比如数学、科学和。
This morning, we have four classes, such as mathematics, science and the arts.
上午，我们上四节课，比如数学、科学和。
This morning, we have four classes, such as mathematics, science and the arts.
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