Learner's definition of THEN
1
: at that time : at the time mentioned当时；那时 -
It was then believed (that) the Earth was flat.那时人们认为地球是平的。
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She lived in the Soviet Union, as it then was called.她曾住在苏联，那个时候就是这个叫法。
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Just then he walked in.就在那时，他走了进来。
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Back then, he was living in New York.那个时候他住在纽约。
2
a —
used to indicate what happened or happens next接着，然后，后来（用于指已经发生或随后发生的事情） -
He walked down the street, then turned the corner.他沿街直走，然后在街角处拐弯。
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First the clowns come out, (and) then the elephants and lions (come out).先是小丑出场，接着是大象和狮子（登台）。
b —
used to indicate what should be done next接下来，然后（用于指接下来该做的事情） -
“Take your first right, (and) then turn left at the light,” he said.“第一个拐弯处向右转，然后在红绿灯处向左转。”他说道。
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Bring the soup to a boil, then turn down the heat and let it simmer for half an hour.把汤煮开，然后改用小火再炖半个小时。
c —
used to indicate something more that must be done or thought of还有，而且（用于指还有其他事情需要做或考虑） 3
a —
used to indicate what must be true or what must or should happen if something else is true or happens那么，因此（用于表示某事的结果） -
If you were there, then you must have seen him.如果你在那儿，那么你一定见过他。
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If it rains, then we can't go.要是下雨，我们就去不了了。
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“It's raining.” “Then we can't go.”“下雨了。”“那我们去不了了。”
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“He confessed.” “The case is closed, then.”“他坦白了。”“那么这个案子就结了。”
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If you want it, then take it. = Take it, then, if you want it.如果你想要，那就拿走。
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Hurry, then, if you want to catch the bus.如果你想赶上公共汽车的话，那就快点。
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What if there should be a fire? What then? [=what will happen then?]要是发生火灾呢？那会是什么情况？
◊ Then is often omitted following if.*then用在if（从句）后常被省略。
b —
used to say or ask about what appears to be true based on what has happened or been said这么说（用于表示对已知情况的判断或询问） -
You did go, then, after all.这么说你终究还是去了。
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Your mind is made up, then?这么说你已经下定决心了？
c —
used to say what has been agreed to or decided那，那么（用于表明某事已商定） d somewhat formal —
used to make a final statement that refers back to the things that have just been mentioned or described总之 -
These, then, are the things you must do.总之这些都是你必须要做的事。
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All of us, then, must accept some blame for these problems.总而言之，我们所有人必须就这些问题承担一些责任。
4
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used after words like all right and OK at the beginning of a statement那么（用在句首的all right、OK等词后）
and then some
— see 2some
(every) now and then
— see 1now
then and there
or chiefly British there and then
: immediately at that place立即；当场 2 then /ˈðɛn/ noun
Learner's definition of THEN
[singular]
: that time那时 -
Since then, I've been more careful.从那时起我更加小心了。
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He advised me to wait until then.他建议我等下去，一直等到那个时候。
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They'll announce their decision next week. Until then, she'll just have to hope for the best.他们下周将宣布决定。在那时之前，她只能抱最好的希望。
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We should get there before then.我们应该赶在那个时候之前到达那里。
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They were friends from then on.从那时起他们就成了朋友。
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Nothing like that had ever happened up to then.在那时之前没有发生过此类事情。
3 then /ˈðɛn/ adjective
Learner's definition of THEN
always used before a noun
: existing at or belonging to the time mentioned当时的