because or is an ambiguous word in english it can mean either or, it can mean not both.
因为或者在英语中是一个模棱两可的词,意思可能是或者,也有可能不是全部。
most systems choose optimal local context window on empirical grounds, which is usually symmetric, the same distance from the ambiguous word to both sides of the window.
afterwards, at the base of parsing tree, the author uses associating headword method to distill the character words the ability of which is strong in expressing the senses of ambiguous word ;