There are usually three main features about the pilot plant test sample:large mass and large grain size of samples, difficulty to control the sample grade.

半工业选矿试样一般有三大特点：质量大、矿岩石样粒度大及控制送样品位难度大。

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Another differentiating element is service heterogeneity or variability which determines a difficulty to control and standardise a service outcome (Palmer, 1998).

另一个微分单元是服务的异质性或可变性确定难以控制和标准化的服务结果(帕尔默，1998年)。

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It is a technical difficulty to control the deformation and the stress condition of the structure of large-scale shield shaft in over-river shield tunnel project.

控制超大盾构工作井的变形和结构受力状态是跨江跨海盾构隧道工程设计和施工的技术难点。

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The Italian government does not want a foreigner to take control, but it would have difficulty using its golden share to block a European bidder.

ECONOMIST: Telecom Italia

The difficulty for marketers is creating the right kind of buzz and learning to control it.

ECONOMIST: Marketing: Building buzz | The

Despite the difficulty finding an O-positive donor, "we try and control the waiting time to be within two to four weeks after arrive to our center, " Lee wrote in October during e-mail exchanges with the Scott family.

FORBES: Magazine Article