Davis has acknowledged shooting the men, but said he did so in self-defense.
戴维斯承认枪击二人，但称属于自卫。
2
Treating depressed teens witha history of abuse and with nonsuicidal self-injurious behaviorsis particularly challenging for psychiatrists, Brent acknowledged.
Brent承认，伴有物质滥用史和非自杀性自伤行为的青少年抑郁患者对精神病学家来说是非常有挑战性的。
3
Study limitations acknowledged by the authors included the fact that the study was observational and aspirin use was self-selected.