热带地区认证系统的第二个消极因素是企业的可靠性将受到质疑，正如沃尔玛可能会发现的。
The second cloud over tropical certification schemes, as Wal-Mart may find, is doubt about their reliability.
工作人员已经为设备升级、树木修剪及全面加强运行与华盛顿地区与新泽西的Pepco电力系统的可靠性而工作了数月。
Crews have been working for months to upgrade equipment, trim trees, and overall harden the reliability of the Pepco power system, which runs from the Washington area into New Jersey.
虽然许多地区都有人口普查的统计数字，但可靠性参差不齐，也没有提供语言结构及语言社会用途方面的信息。
While census Numbers exist for many areas, they vary in reliability and provide no information about the structure of languages or their use in society.
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