gōng zuò rén yuán / dìng qī / xiū jiǎn / jīn yú zǎo / yǐ miǎn / tā / zhǎng / de / tài / mì / yǐng xiǎng / shuǐ zhōng / de / guāng xiàn工作人员定期修剪金鱼藻,以免它长得太密,影响水中的光线。The staff regularly trim the hornwort so that it does not grow too densely and block light in the water.