The document might have two tool clauses followed by a procedure clause, or three location clauses in a row. Suppose you want to produce output that looks like this
文档中的一行可能有两条tool子句，后面跟了一条procedure 子句，或者三条location 子句。
For each location, the SELECT clause retrieves the location ID and the tools used at that location.
对于每个位置，SELECT子句检索位置ID以及此位置所用的工具。
At the clause stratum, a locative prepositional phrase functions to foreground the temporal location as a marked theme while it functions to background the spatial location.
在小句层面，处所介词短语把时间处所前景化为有标记主位，而把空间处所背景化。
At the clause stratum, a locative prepositional phrase functions to foreground the temporal location as a marked theme while it functions to background the spatial location.
在小句层面，处所介词短语把时间处所前景化为有标记主位，而把空间处所背景化。
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