Where food remains are not preserved, δ13C measurements should be made on modern plants and animals that were likely to have contributed to the diet and from the same locality as the population under study in order to estimate possible ranges of dietary δ13C values.。。这个句子咋翻译啊，句子结构怎么划分？？附件是我自己划的，又觉得不对。。。。
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