Question

只有当演员把台词背得滚瓜烂熟时，我们排戏才会有成效。 zhǐ yǒu dàng yǎn yuán bǎ tái cí bèi de gǔn guā làn shú shí， wǒ men pǎi xì cái kuài yǒu chéng xiào。

Accepted Answer

Only when the actors have their lines(down) pat can we practice the play effectively.

Expression	只有当演员把台词背得滚瓜烂熟时，我们排戏才会有成效。
Meaning	Only when the actors have their lines(down) pat can we practice the play effectively.
Reading	zhǐ yǒu dàng yǎn yuán bǎ tái cí bèi de gǔn guā làn shú shí， wǒ men pǎi xì cái kuài yǒu chéng xiào。

Yǒu 只有当演员把台词背得滚瓜烂熟时，我们排戏才会有成效 Actors Lines(down Pat Practice Play Effectively