a grain of millet in a granary ? 江東去此兩人，如大木飄一葉，太倉減一粟耳；……(《三國演義》384) Two persons who could be easily spared from this populous country.They would not be missed any more than a leaf froma tree or a grain of millet from a granary…
太倉稊米tài cānɡ tí mǐ
太倉：指古代京師儲(chǔ)藏糧食的大倉；稊米：小米。大倉里的一粒小米。比喻非常渺小，微不足道。a mere grain in the barn, a grain of millet in a granary, very small portion of sth. vast