例句：
An old dog cannot alter its way of barking.
中文: 老狗难改吠声。 更详细进入...
But not everyone is convinced.
中文: 然而，众口难调。 更详细进入...
Difficulties come on one after another.
中文: 困难相继出现. 更详细进入...
Difficulties have come one after another.
中文: 困难相继出现. 更详细进入...
Difficulties come again and again.
中文: 困难相继出现. 更详细进入...
He is hard to deal with.
中文: 他很难打交道。 更详细进入...
I'm having trouble breathing.
中文: 我呼吸有困难。 更详细进入...
It's hard to loosen a fast knot.
中文: 死结很难解开. 更详细进入...
Predicting the future can be difficult.
中文: 预言未来很难。 更详细进入...
So that is hard to balance.
中文: 因此很难平衡。 更详细进入...
Sometimes the pronunciation is difficult.
中文: 有时发音很难。 更详细进入...
The difficulties came up consecutively.
中文: 困难相继出现. 更详细进入...
The difficulty appear one by one.
中文: 困难相继出现. 更详细进入...
This is harder than it sounds!
中文: 这比听上去难！ 更详细进入...
What happened to upset you?
中文: 你为什么难过？ 更详细进入...
Cretaceous The most recent period of the Mesozoic era, 145-66 million years ago.
中文: 白垩纪：地质年代中生代的最后一个纪，距今一亿四千五百万年至六千六百万年前。 更详细进入...
I love to do hundreds of problems each day.
中文: 每天我爱做成千上万的练习题。 更详细进入...
