"由直升机运送" 可以翻译为 "be transported by helicopter" 或者 "be delivered by helicopter" 。
例如：
The injured were transported by helicopter to the nearest hospital.（伤员由直升机运送到最近的医院。）
The supplies will be delivered by helicopter to the remote area.（物资将由直升机运送到偏远地区。）