所述动力工具包括内壳（50），该内壳至少部分地容纳在外壳（30）中并且与外壳（30）隔开。

The power tool includes an inner housing (50) at least partially housed within and spaced from an outer housing (30).

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依据该理论，对前五周期原子的内禀（亚）壳层结构、内实（价）壳层结构进行了研究。

The intrinsic (sub)shell structure and core (valence) shell structure of atoms from the first- to the fifth- row in the periodic table are evaluated.

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作用是防止泵壳内液体沿轴漏出或外界空气漏入泵壳内。

Role is to prevent the pump shell leakage of liquid along the axis or outside air leakage into the pump shell.

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Core electrons are all those electrons held in really tight with the nucleus in the inner shells, whereas the valence electrons are only those electrons that are in the outer-most shell, or at your highest value of n of the principal quantum number.

芯电子是那些,在内壳层被原子核束缚得非常紧的电子，而价电子只包括,最外层的电子，或者说主量子数，n，的值最大的那些电子。

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