词汇	scan substring
释义	scan substring 扫描子串
随便看	firsthand description first-hand descriptions first-handedness first-handednesses firsthand evidence first-hand evidence firsthand exchange first hand exchange firsthand experience first-hand experience first -hand experience first hand hap Firsthand historical materials firsthand impression firsthand information first hand information first-hand information firsthand investigation first hand investigation firsthand knowledge first hand knowledge firsthand labour firsthand look firsthand material first hand material