经查无问题时应当及时退还。

The blank invoice, when proved no problem, should be returned immediately.

此种破坏引起断奶幼鼠贪食现象似无问题，但贪食现象可被其它因素如生长发育素分泌不佳所掩蔽。

This was interpreted as to mean that ventromedial lesions in weanling rats also have caused hyperphagia although the overeating may be masked by the concommitant growth hormone insufficiency.