If something changes substantially or is substantially different, it changes a lot or is very different.
例句
The percentage of girls in engineering has increased substantially...學工科的女孩的比例已經大大增加了。The skin of an eighty-year-old looks substantially different from that of a twenty-year-old...80 歲人的皮膚與 20 歲人的皮膚看起來有天壤之別。
ADV
基本上;大體上;總的來說
If you say that something is substantially correct or unchanged, you mean that it is mostly correct or mostly unchanged.
例句
He checked the details given and found them substantially correct...他核實了一下給出的細節，發現它們基本正確。BBC Television remains otherwise substantially unchanged.而英國廣播公司的電視節目在其他方面基本沒有變化。
英漢詞典釋義
adv.
本質上,實質上;大體上
His account of what happened is substantially accurate.他對事情的敘述實質上是準確的。
相當多地,大大地
The price may go up quite substantially.價格可能大大上揚。
英英詞典釋義
Adverb
1. to a great extent or degree;
"I'm afraid the film was well over budget""painting the room white made it seem considerably (or substantially) larger""the house has fallen considerably in value""the price went up substantially"