立彬の日本語
岩石や鉱物はいろいろな面で私たちに有益である。
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Rocks and minerals are useful for us in many ways.
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岩石， がんせき
1. rock
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鉱物， こうぶつ
1. mineral
矿物
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いろいろ， 色々， 色色
1. various, a variety of, all sorts of, many (different)
2. variously, in various ways, in many ways
3. various things, this and that
各种各样的，多种多样的，形形色色的，许多(不同的)；以各种方式，以多种方式；各种各样的事，这儿那儿的
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私たち， 私達， わたしたち， わたくしたち
1. we, us
我们
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有益， ゆうえき
1. beneficial, profitable, useful, helpful, instructive
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である
1. be, is
是、=です、=だ
は
1. indicates sentence topic
2. indicates contrast with another option (stated or unstated)
3. adds emphasis
指示句子的主题；表示与另一选项（无论是否明确提及）形成对比；表示强调
で
1. at, in
2. at, when
3. by, with
4. within, in
5. and then, so
6. and, then
7. let me tell you, don't you know
表示范围
に
1. at (place, time), in, on, during
2. to (direction, state), toward, into
3. for (purpose)
4. because of (reason), for, with
5. by, from
6. as (i.e. in the role of)
7. per, in, for, a (e.g. "once a month")
8. and, in addition to
9. if, although
tbd
