However, the modes of centralized access control and key distribution limit the extension of their group sizes.

然而，由于其集中式访问控制和密钥分配方式，限制了组规模的进一步扩展。

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The use of spot urine samples with such small group sizes is not a rigorous approach.

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The group also says there should be limits on the GSEs' portfolio sizes and they should have strong capital requirements.

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They were a tiny group of civil servants, far more fascinated by the precise details (weights, measures, sizes, costs) of the engineering feat they were attempting than the human courage that the project required.

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