Allene is an isomer of methyl acetylene.丙二烯是甲基乙炔的一种异构体.Allene oxide synthase ( AOS ) is a key enzyme for JA biosynthesis.丙二烯氧化物合成酶 ( AOS ) 是茉莉酸生物合成的关键酶....

美岛科...

challenge的复数形式为：challenges...

challenge的第三人称单数（三单）为：challenges...

Allen的音标：Allen的英式发音音标为：['ælən]Allen的美式发音音标为：['ælən]...

adj.残疾的，有伤的，有缺陷的或缺少的，受到挑战的v.“challenge”的过去式和过去分词...

challenged的音标：challenged的英式发音音标为：['tʃælɪndʒd]challenged的美式发音音标为：['tʃæləndʒd]...

These two features make shadow detection and removal very challengeable.这两个特征使阴影的检测和消除具有相当挑战性.Freelancer is toilsome and enjoyable; it is a challengeable occupation full of more feelings of achievement!自由翻译是辛苦的、也是快乐的; 是具...

challengeable的音标：...

The secret to happiness is to keep setting yourself new challenges.幸福的秘诀就是要不停地给自己设定新的挑战。Dara challenges our stereotypical ideas about gender and femininity.达拉对我们老一套的性别和女性特质观念提出了异议。Offe also challenges the postulate of an...

I did not think he was right, so I challenged him.我认为他是不对的, 因此向他提出质疑。This was Hyer's last fight, for no one else challenged him...这是海尔的最后一场比赛，因为再没有人向他发起挑战。I challenged him on the hypocrisy of his political attitudes...

The Frenchman held his own against the challenger.这名法国人顶住了挑战者的进攻。the official challenger for the world championship title世界冠军头衔的正式挑战者The judges gave the nod to the winning challenger.裁判们对挑战者的胜利给予确认....

challenge的近义词/同义词有：doubt, confront, defy, question, dispute, dare, dispute, mistrust, play, objection, doubt, dare, question, invitation, confront, controvert, defy。vt.challenge的近义词（挑战;怀疑;反对）：doubt, confront, defy, quest...

crestfallen的音标：crestfallen的英式发音音标为：['krestfɔ:lən]crestfallen的美式发音音标为：['krɛstˌfɔlən]...

methallenestril的音标：methallenestril的英式发音音标为：[me'tæli:nɪstrəl]methallenestril的美式发音音标为：[me'tælinɪstrəl]...

Allenite的音标：...

Online gaming allows players from around the world to challenge each other.网络游戏使得全球的玩家可以相互较量。He said he's game for a similar challenge next year.他说他明年还愿意接受类似的挑战。Increasingly, more wine-makers are taking up the chall...

n.艾伦（男子名，涵义：英俊，好看的）...

He gathered himself up and sneaked off, crushed and crestfallen.他爬起来,偷偷地溜了,一副垂头丧气 、 被斗败的样子.The youth looked exceedingly crestfallen.那青年看上去垂头丧气极了.The individual to whom the manager had been talking went away quite crestfa...

fallen的音标：fallen的英式发音音标为：['fɔ:lən]fallen的美式发音音标为：['fɔlən]...

challenge的音标：challenge的英式发音音标为：['tʃæləndʒ]challenge的美式发音音标为：['tʃæləndʒ]...

The bus is said to have over-turned and fallen into a ravine.据说巴士发生翻车，跌进了峡谷。Food production has already fallen behind the population growth.粮食生产已经跟不上人口增长。A couple of inches of dry, powdery snow had fallen.下了数英寸厚的粉状干雪。...

challenging的音标：challenging的英式发音音标为：['tʃælɪndʒɪŋ]challenging的美式发音音标为：['tʃæləndʒɪŋ]...

challenges的音标：...

mallenders的音标：mallenders的英式发音音标为：['mæləndəz]mallenders的美式发音音标为：['mæləndəz]...

allene的音标：allene的英式发音音标为：['æli:n]allene的美式发音音标为：['ælin]...

adj.挑战性的，引起兴趣的，令人深思的v.挑战，质疑(challenge的现在分词)...

n.阵亡者adj.倒下的，（女子）已失身的，落下的，落在地上的v.降低( fall的过去分词 )，来临，成为，降落...

crestfallen的近义词/同义词有：discouraged, dejected, downcast, depressed。adj.crestfallen的近义词（气馁的）：discouraged, dejected, downcast, depressed。...

n.丙二烯，二烯烃，丙二烯衍生物...