Let's do an example. Let's try to figure out if we have just a uniform disk how hard it is to spin it around its center.
还是看个例子吧，有一张均匀的唱盘，让它绕中心旋转有多难呢？
Nevertheless, when her children were present, she always felt the center of her heart go hard.
因此，每当孩子们出现在她面前，她总感到心头发紧。
And the recession has pressed hard on the broad center of American society.
大萧条已经重重打击到了美国社会的中坚部分。
As for myself, my plan is to study English hard and to be a volunteer to teach English in the community center.
至于我本人，我的计划是努力学习英语，自愿到社区中心教英语。
I accidentally bit into the hard seed at the center of the peach.
我不小心咬到了这个桃子的核。
The chorus spoke from a hard-surfaced circle (orchestra) at the center of the audience.
合唱团在观众中心的硬地上表演。
The chorus spoke from a hard-surfaced circle (orchestra) at the center of the audience.
合唱团在观众中心的硬地上表演。
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