立彬の日本語
彼はひとりになると即座にその手紙を開いた。
tbd
The moment that he was alone he opened the letter.
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ひとり， いちにん， 一人， １人， 独り
1. one person
2. being alone, being by oneself
3. being single, being unmarried
4. by oneself, alone
5. just, only, simply
一个人
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になると
1. when it becomes, when it comes to
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即座に， そくざに
1. immediately, right away, on the spot
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その， そん， 其の
1. that, the
2. part (as in "part two")
3. um ..., er ..., uh ...
那个；部分（如“第二部分”）
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手紙， てがみ
1. letter, note
信件，便条
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を
1. indicates direct object of action
2. indicates subject of causative expression
3. indicates an area traversed
4. indicates time (period) over which action takes place
5. indicates point of departure or separation of action
6. indicates object of d...
表示动作的直接对象；表示经过的场所；表示离开或分开的点
彼， かれ
1. he, him
2. boyfriend
他
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
