Usages of sankai
寮 の 三階 に 郵便箱 が あります。ryou no sangai ni yuubinbako ga arimasu.
There is a mailbox on the third floor of the dormitory.
図書館 の 三階 で 日本語 を 勉強します。toshokan no sankai de nihongo o benkyoushimasu.
I study Japanese on the third floor of the library.
寮 の 三階 に 留学生 が いる。ryou no sangai ni ryuugakusei ga iru.
There is an international student on the third floor of the dormitory.
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