know from

基本解释

I know from conversations with other smokers that this is not unusual.
我知道，這是一場對於其他吸菸者的不尋常的談話。
Dieticians know from their experience that it is very difficult to reduce the usual quantity of food, which is the reason of most failures.
膳食專家從他們的經騐知道，要減少日常的進食量是十分睏難的。這正是大多數人減肥失敗的原因。
You know from this result that inserting this type of string would not result in a successful login attempt, so the site is not vulnerable to this type of attack.
從這個結果可以知道，插入該類型的字符串不會導致成功的登錄嘗試，所以站點不容易受到這種類型的攻擊。

We see that you know from everyone,they say their interest in science begins before the age of eleven.
So, we know from our calculation that we can do over here, that this bond is polar.
我們通過計算都知道,這個鍵是非極性的。
麻省理工公開課 - 固態化學導論課程節選
it just so happened that two other people I know from back home transferred the same time I did.
剛好我在家認識的兩個人也和我同時轉過來了。
畱學生的適應期 - SpeakingMax英語口語達人

Ms. GALBREATH: ...it's a different mind-set from the people that I know from the Midwest.
NPR: Tsunami Warning Rattles Nerves Along Calif. Coast