An attack rate is an incidence rate usually expressed as a percentage.

发病率是将疾病发生率用百分数表示。

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They are usually expressed as declarative statements in the form of "the system shall do..."

它们通常被表示为“系统应做…”形式的陈述语句。

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They are usually expressed as declarative statements in the form of "the system shall do..."

它们通常被表示为“系统应做…”形式的陈述语句。

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