游北京故宫作文300字:必须,必需的用法

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must
(中古英语 moste<古英语 moste 必须)

v
必须;应当
We must obey orders.
我们必须服从命令。
I must shut the door, or the rain will come in.
我必须把门关上,不然雨就进来了。
必定;非常可能
You must be tired after your long journey.
你走了这么远的路,一定很累。

must
n
必需的东西; 必须做的事
Warm clothes are a must in the mountains.
住山里必须备有厚衣服。
need
中古英语nede<古英语nied

v
(否定形式略写为 needn't) (常与to连用)
需要
Plant needs water.
植物需要水。
He needed all his charm to persuade her that it was not his fault.
他需要使出浑身解数来叫她相信那不是他的错。
My shirt needs a button.
我的衬衫需要一枚钮扣。
She's on holiday; she needed a change from work.
她正在度假,她需要放下工作改变一下生活。
These six kitchens are all needed when the plane is full of passengers.
这六个厨房在飞机载满旅客时都用得着。
You didn't need to tell him the news; it just made him sad.
你无需告诉他这一消息, 那只会使他悲哀。
必须,不得不
You needn't talk so loud.
你不必这么大声讲话。
Need you go so soon?
你非得这么快就走吗?
We need to work harder.
我们必须更加努力工作。
You needn't have told him the news; he knew it already.
你不必再告诉他这个消息,他已经知道了。

必须 :
bì xū
①表示事理上和情理上的必要;一定要:学习~刻苦钻研。②加强命令语气:明天你~来。‖‘必须’的否定是‘无须’、‘不须’或‘不必’。
必需 :
bì xū
一定要有的;不可少的:日用~品ㄧ煤铁等是发展工业所~的原料。 侧重需要