进一步将三元模型空间限制在低位字符会产生较小的空间，但整体结果不是很好。

Limiting the trigram space even further than to low-bit characters produces a smaller space, but not better overall results.

youdao

下标字符：较内文字为细的字母或数字，放置于基线或更低位置。

Inferior characters: Letters or Numbers which are smaller than text size and are positioned on or below the baseline.

youdao

下标字符：较内文字为细的字母或数字，放置于基线或更低位置。

Inferior characters: Letters or Numbers which are smaller than text size and are positioned on or below the baseline.

youdao