The fact that Google's purchase of mobile AD network AdMob is currently under review by the Federal Trade Commission may have also contributed to the restraint of the market.

此外，Google收购移动广告公司AMob一事正在接受联邦贸易委员会(FTC)的调查，这可能也是导致Google股票下跌的原因之一。

The weakness of the Principles of Accounting and System of Accounting in operation confines the restraint and supervision of the related trade.

现行相关的会计准则和会计制度的不足，局限了对关联交易的约束和监管。