" Crookshanks? " wheezed Hermione, bent double, clutching her chest.
“克鲁克山？”赫敏气喘吁吁地说，弯腰揪着自己的胸口。
VOA常速英语_科技
They double clutch all the time.
它们总是紧紧抱窝。
VOA常速英语_美洲
They double clutch all the time. Six to eight eggs per laying. Six has been the magic number this year.
而且产蛋枚数为双数，每次产蛋六到八枚，今年产的最多的是6个。
中文百科
双重离合器 Double clutch (technique)
（重定向自Double clutching）
双重离合器为一种高端的驾驶技术。
操作进程
踩下离合器踏板，松开油门并入空档
放开离合器踏板使引擎转数自然下降 (上斜时则应由高档转低档时则应补一脚空油以使更容易进档)
再踩下离合器踏板，入档
一个熟练的司机可以用少于一秒的时间完成以上操作。
英语百科
Double clutch (technique) 双重离合器
（重定向自Double clutching）
Double clutching (also called double declutching) is a method of shifting gears used primarily for vehicles with an unsynchronized manual transmission, such as commercial trucks and specialty vehicles. Double clutching is not necessary in a vehicle that has a synchronized manual transmission.