此外，其他阻止磷酸二酯酶活性的化合物不是兴奋剂。

Moreover, other compounds that block phosphodiesterase's activity are not stimulants.

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但 Snyder 等人指出，抑制脑内磷酸二酯酶产生所需的咖啡因浓度要比产生刺激的咖啡因浓度高得多。

But Snyder et al point out that the caffeine concentrations needed to inhibit the production of phosphodiesterase in the brain are much higher than those that produce stimulation.

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但是调查发现该公司用棕榈油代替邻苯二甲酸二酯（DEHP），来降低成本。

But the company was found to have substituted palm oil with the Di-phthalate, or DEHP, to cut production costs.

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