區(qū)別就是兩者意思是不一樣具體的不同如下

increase to中文意思是增加到……

While welding current increase to a threshold the arc will not go out.

焊接電流增加到一定值時，就可消除熄弧和再引弧現(xiàn)象，使工頻正弦交流TIG電弧也具有良好的電弧穩(wěn)定性。

increase by中文意思是增長百分之……;

例句

The Bureau of Labor Statistics projects that while the number of nurses will increase by 19 percent by 2022, demand will grow faster than supply, and that there will be over one million unfilled nursing jobs by then.

勞工統(tǒng)計局預計，雖然到2022年護士人數(shù)將增加19%，但需求增長將快于供給，屆時將有100多萬個空缺的護理崗位。