slackened的音标：...

backpedal的现在完成时为：backpedaled...

lackluster的音标：lackluster的英式发音音标为：['lækˌlʌstə]lackluster的美式发音音标为：['lækˌlʌstə]...

n.单刃刀，木剑...

砷镍铜矾...

Some backtracking is probably inevitable.有时改变决定可能是不可避免的。Leonard jumped in his car and started backtracking.伦纳德跳进车里，开始原路折返。The backtracking mechanism is an important facility for programming in logic.回溯机制是逻辑程序设计的重要设施....

Pezzo takes tight turn downhill as spectators line the side of track.佩佐下山急转弯,观众站在赛道旁观看.With eleven thousand employees, it's very difficult to keep track of them all.对于一支1.1万人的员工队伍，很难及时了解到所有有人的动态。Dozens of miles of r...

v.回[逆]交，回交杂种( backcross的过去式和过去分词 )...

n.挫折，阻碍，退步，逆流...

bracket的一般过去时为：bracketed...

backslap的一般过去时为：backslapped...

backlog的复数形式为：backlogs...

Every part of the system has a backup.系统的每个部分都有备用元件。She once sang backup for Madonna.她曾经为麦当娜伴唱.Have you kept a backup of this file?你把这文件备份了 吗 ?...

blackjack的现在完成时为：blackjacked...

n.爆竹，鞭炮...

n.回扫，回描，回归...

Bush has racked up victories in another five states.布什在另外五个州又获得了胜利.A toothache racked my jaw.牙疼使我的下巴难受极了.The pain racked him.痛苦折磨着他....

horseback的音标：horseback的英式发音音标为：['hɔ:sbæk]horseback的美式发音音标为：['hɔrsbæk]...

backwoodsmen的音标：...

backslap的现在进行时为：backslapping...

v.退格( backspace的过去式和过去分词 )...

n.夹碎坚果的钳子，胡桃钳，瘪嘴...

n.后座议员席位...

backbiting的音标：backbiting的英式发音音标为：['bækbaɪtɪŋ]backbiting的美式发音音标为：[]...

偿还，报复，报答，偿付...

lumberjack的音标：lumberjack的英式发音音标为：['lʌmbədʒæk]lumberjack的美式发音音标为：['lʌmbərdʒæk]...

kickbacks的音标：kickbacks的英式发音音标为：['kɪkbæks]kickbacks的美式发音音标为：['kɪkbæks]...

stack的现在进行时为：stacking...

backpack的音标：backpack的英式发音音标为：['bækpæk]backpack的美式发音音标为：['bækˌpæk]...

crackdown的复数形式为：crackdowns...