The introduction of CELS to the English training market in China is only a result of their efforts.

CELS英语技能证书在中国市场上的隆重推出，就是其所作的此种努力之一。

Cels are more of a problem because they are more expensive to retake and take more time to produce.

赛璐璐胶片是个更大的问题，因为重做这东西更贵，也更花时间。

He landed his first job washing animation cels in 1932, working for legendary Disney animator Ub Iwerks.

1932年他找到了第一份工作，是为迪斯尼公司的传奇人物乌伯·伊沃克斯动画师的动画片涂色。

Cels were now being used by nearly everyone and animated cartoons were showing up frequently in film programs.

现在几乎每一个人都使用赛璐珞片，而且动画卡通也经常在电影节目中出现。

However, CELs show more unity and stereotype, whereas AESs more diversity and individuality in the choice of query preparatory patterns.

研究还发现，中国英语学习者选择英语探询句式类型比较统一，定型；