Other studies based on intermittent sampling with older instruments, indirect evidence or studying bears with lots of people nearby have left the matter “uncertain, ” as he puts it.
Studies show that surface sediments of the flood land seem to be the best sampling media in ultra-low density geochemical investigation in forest-swamp areas.
研究成果表明，河漫滩表层沉积物是森林超低密度地球化学调查的最佳采样介质。
3
The basic laws of reproductive behavior and the relation between them and environment of Henry chestnut have been studied through sampling investigations and tracing studies.