例句與造句

1. The joint toxicity of heavy mental ions lead , zinc and cadmium to hydra sp . was evaluated using the additive index method
   摘要以水螅為實驗生物，采用相加指數(shù)法，研究了鉛、鎘和鋅3種重金屬離子復合污染物的聯(lián)合毒性。
2. It's difficult to find additive index in a sentence. 用additive index造句挺難的