说增加或降低的幅度,一般在动词后面用by;
说增减或降低到的数量,一般在动词后面用to,
说一个东西的比例,一般在比例数量的后面用of.
例如,
the quantity of sale in this quarter increases/reduces by 30% comparing to last quarter
90% of the products have problem
this part occupies 80% of the total
说增加或降低的幅度,一般在动词后面用by;
说增减或降低到的数量,一般在动词后面用to,
说一个东西的比例,一般在比例数量的后面用of.
例如,
the quantity of sale in this quarter increases/reduces by 30% comparing to last quarter
90% of the products have problem
this part occupies 80% of the total