Printing traditionally has been defined as a technique for applying under pressure a certain quantity of colouring agent onto a specified surface to form a body of text or an illustration.
印刷传统上被定义为一种通过压力把一定量颜料施加上一特定表面，从而形成文本或图画的技巧。
The library writes off a certain quantity of books each year.
图书馆每年都注销一定数量的图书。
Air is a mixture of gases with a certain quantity of solids and usually some liquids mixed in.
空气是各种气体的混合物，其中也含有一定量的固体，也往往混有某些液体。
After anaerobic cultivation for a definite time, a certain quantity of sludge suspension was used for oxidation titration experiment.
经过一定时间培养后，取一定量的污泥悬液进行氧化滴定实验。
After anaerobic cultivation for a definite time, a certain quantity of sludge suspension was used for oxidation titration experiment.
经过一定时间培养后，取一定量的污泥悬液进行氧化滴定实验。
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