Grammar Note
表示乘坐方式时常用 by helicopter，不加冠词。
直升机
先理解核心含义，再看它在真实句子里的用法。
直升机
An aircraft lifted and propelled by overhead rotating blades, able to hover and move in any direction.
A helicopter hovered above the crowd, filming the event.
一架直升机在人群上方盘旋，拍摄这一活动。
一种由一组或多组长旋翼驱动的飞行器,可悬停、任意方向移动(包括后退)或着陆,通常尾部有较小的旋翼用于稳定。
An aircraft that is borne along by one or more sets of long rotating blades which allow it to hover, move in any direction including reverse, or land; and typically having a smaller set of blades on its tail to stabilize the aircraft.
一种没有机翼的飞行器,依靠顶部旋翼旋转产生升力。
an aircraft without wings that obtains its lift from the rotation of overhead blades
一种带有旋转叶片的动力抹光机,用于摊铺混凝土。
A powered troweling machine with spinning blades used to spread concrete.
某些树木(如白蜡树、榆树和枫树)的带翼果实。
The winged fruit of certain trees, such as ash, elm, and maple.
The crew loaded the supplies onto the helicopter before takeoff.
机组人员在起飞前把物资装上直升机。
They reached the island by helicopter in under an hour.
他们在不到一小时内乘直升机到达了那座岛。
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表示乘坐方式时常用 by helicopter，不加冠词。
Collins 词频等级为 3，建议结合例句记忆，而不是只背中文释义。
页面下方列出了常见词形变化。学习时注意它们在句子中的语法位置。
Dictionary facts from DICTIONARY_API_DEV, ECDICT, WIKTIONARY.