The term "test weight" refers to density and specific gravity of the rice. For one unit volume of rice (a liter in this case), the greater the weight, the plumper the rice and the better the quality.
所謂容重量，是指稻米的密度和比重，以每公升為測量單位，品質越好的稻米，重量越重、飽滿度越佳。