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Sentence

示し準じゅん化か石せきは地ち層そうの年ねん代だいを決きめるのに役やく立だつ。

Span Details

示し準じゅん化か石せき

index fossil; guide fossil

地ち層そう

stratum; geological layer; bed

possession, attribution, nominalizer, or nominal linker

年ねん代だい

period; era; decade; date; age group; generation; age range

decide; choose; determine; settle; fix; appoint; clinch (a victory); decide (the outcome); persist in doing; go through with; always do; have made a habit of; take for granted; assume; dress up; dress to kill; dress to the nines; carry out successfully (a move, pose, etc.); succeed in doing; immobilize with a double-arm lock (sumo, judo, etc.); eat or drink something; take illegal drugs

although; despite; in order to

役やく立だつ。

be useful; be helpful; serve the purpose