Trivial wounds and injuries, if not treated promptly, may lead to serious infections.小伤小痛如果没有马上处理可能会导致严重感染。Badly infected trees should be felled and burned.受到严重感染的树木应砍倒并烧毁。The patient has experienced recurrent/repeated episodes of severe infection.那个病人经历了反复的严重感染。