/hɑːrd/
形容词
坚硬的，坚固的
Heating the clay makes it hard.
黏土加热会变硬。
困难的，费力的
It's hard to say which of them is lying.
很难说他们当中哪个在说谎。
耗费体力（或脑力）的；辛苦的
It was hard work on the farm but satisfying.
农场的活儿很辛苦，但让人有满足感。
想跟读，去练习
