下一步该做什么他们心里没底。

They were unsure as to what the next move should be.

她说面对那双双明亮的眼睛，心里没底。

She said that both the face of the bright eyes, not sure.

因为是养在闺中的千金蜜斯，打听起来非常的不容易，这让她心里有些没底。

Because being Ms. daughter who keeps in the Gui, beating to sound is very not easy, this makes her in the mind some to have no bottom.

现对跌坎式底流消能工消力池内水流流态的演变进行了初步分析，随着入池能量的变化，消力池中会产生混合流、淹没混合流、淹没底流以及远驱底流流态。

With the change of in-take energy, the flow patterns in the stilling basin are:mixed flow, submerged mixed flow, submerged bottom floor and far-forth drove bottom floor.