移取2mL此溶液到50mL容量瓶中并用缓冲溶液定容至刻度，混匀。
Transfer 2.0 mL of this solution to a 50-mL volumetric flsk, dilute with Buffer solution to volume, and mix.
中考试卷是一把刻度不均匀的尺子：对于你自己来说，难题的分值不一定高。
In the exam papers is a ruler of uneven scale: for yourself, the problem of the score is not necessarily high.
由于刻度环境的限制，测量值与地层真值有一定的差别。
Due to the limit of tool scale environment, the measurement is also different from the true value.
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