稀溶液用英语称为 dilute solution.
来源：稀溶液是由稀释溶液得来的词汇，"dilute" 意思是稀释，而 "solution" 意思是溶液。
例句1: The scientist prepared a dilute solution of hydrochloric acid.
（科学家准备了一种稀释的盐酸溶液。）
例句2: The nurse gave the patient a dilute solution of morphine for pain repef.
（护士给病人稀释的吗啡溶液来减轻疼痛。）
例句3: The experiment required a dilute solution of copper sulfate to be added to the test tube.
（实验要求在试管中加入稀释的硫酸铜溶液。）