保留数 meaning in English

encumbrance

For example , if your array has only one dimension , you can resize that dimension and still preserve all the contents of the array , because you are changing the last and only dimension
例如，如果数组只有一维，而可以调整该维度的大小并依然保留数组的所有内容，因为您更改的是最后一个并且唯一的维度。
Recordings are stored in first in first out basis , thus assuring perpetual recording without replacing cf card . the length of period recordings are stored within the microlog is dependent on the frequency of calls and cf cards storage size
不需更换任何录音组件，录音循环储存，依记忆卡容量及通话频率， ?录音在机内可保留数周至数月以上。