The following sentence stands isolated:


First, my attempt at translation: "With the world heritage, there are buildings and nature which we must from now on leave to our children and grand children."

I've no idea how to meaningfully translate this とは. と "adds up" with は here, but I can't make much sense of と in this position.

I must add that I feel very unsure about the whole sentence. I just learned about the -ていく construction which expresses that one is entering times of change from now on. I made 残していかなければならない an attribute to 自然や建物 because I couldn't muster an interpretation which would have made more sense. But I couldn't find a way to translate 残していかなければならない without 自然や建物 and this makes me doubt my understanding of the -ていく pattern...^^

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    I think that と is introducing a definition. See japanese.stackexchange.com/questions/19310/… Sep 14, 2017 at 19:32
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    I agree with @user3856370 as I've already seen in a game this same と used as "Xとは?" Followed by an explanation of what X is so I guess what follows 世界遺産とは explains what the world's heritage is.
    – Ushiromiya
    Sep 14, 2017 at 22:17

2 Answers 2


You can think of  とは as a formal version of は.

As for ~ていく, you can think of it as "going in the direction of that verb".

So here it's more like "we must go in the direction of leaving nature and buildings for our posterity". The ていく is being used to express movement, or change as you stated.


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    「子どもたちに残していく」の「ていく」は、「空が明るくなっていく」の「ていく」のように change とか movement を表すんじゃなくて、「将来/ずっと~し続ける」 continue to do って意味じゃないんですかね・・・
    – chocolate
    Sep 15, 2017 at 3:54
  • Well it's sort of the same thing really if you think a bit more abstractly Sep 15, 2017 at 8:11

The とは is commonly used to express an explanatory or defining "is a".

It is not uncommon to find text (in forums or sites) asking


to ask people what something is. Think of it as used in definitions.

Q: 学校とは? What is a school?

A: 人が教育を受ける場所である。 It is where people receive education.

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