The phrase "keep almost unchanged" is correct and usable in written English.
It means to preserve or maintain something with minimal or very small alterations. Example: In order to honor the original author's intentions, the translator tried to keep the meaning and tone of the text almost unchanged.
Both A2g and B2g peak positions keep almost unchanged.
The disordered α′ transforms to ordered α and β forms gradually with increasing in draw ratio, whereas βC-crystals keep almost unchanged during the whole drawing process.
It is worth noting that for the sampling frequency of 44.1 kHz or higher, the samples of length 10 s in number keep almost unchanged.
Additionally, the superhydrophobicity and exquisite heat release performance of the products keep almost unchanged after ultra-long exposure time and high relative humidity (>90%), respectively, indicating the excellent stability and great resistance to changeable environment and wide application potential in fields of surface chemistry, materials science and engineering, physics, etc.
Furthermore, the decoupling characteristics are kept almost unchanged for large system parameter variations and uncertainties.
After 240 cycles of set and reset operation by DC sweeping, the forward/reverse current ratio keeps almost unchanged.
After peak frequency, the velocity decreases till the valley frequency where the minimum electrothermal flow can be achieved, and then increases again, and finally keeps almost unchanged.
The Mg/O ratio increases with set |Vp| until |Vp| is 450 V, and then keeps almost unchanged with set |Vp| up to 750 V.
As to the reproducibility between days, it was similar to that of within day repeatability if, the temperature was kept almost unchanged.
This is illustrated in Figure 13: when IC decreases, the gradient along the ILD axis keeps almost unchanged, but the gradient along the ITD significantly decreases.
The ingredient of the electrolyte keeps almost unchanged owing to the balance of oxidized and reduced species in the solution [5].
