根据现有证据，可以得出结论该政策已大体有效。
From the evidence available, it may be concluded that the policy has been largely effective.
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May英 /meɪ/|美 /meɪ/
Be英 /biː/|美 /bi/
concluded英 /kənˈkluːdɪd/|美 /kənˈkludɪd/
解释
may be concluded 是情态动词 may + be + 过去分词 concluded 构成的情态被动，用于基于证据给出审慎结论，语气比 can 更不确定、更谨慎。
From the evidence available, it may be concluded that the policy has been largely effective.
may be concluded 是情态动词 may + be + 过去分词 concluded 构成的情态被动，用于基于证据给出审慎结论，语气比 can 更不确定、更谨慎。