心算

Even if he is not learning abacus, he will also numeracy, to settle scores, can think of!

即使他现在不学珠心算，他将来也能识数，能算帐，能思考的！

I get a mental block every time I try to do sums in my head.

每次我用心算做加法时，我的脑子就木了。

Non-Givin often must modify the ships since some areas are not pressurized, and the vessels have minimal nav computers, since Givin do most of the astrogation calculations in their heads.

但异族人往往须对这些飞船加以改造，因为部分船舱没有增压装置，而且导航电脑也精简了，因为大多数的宇航计算吉文人都能用心算完成。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。