同学你好，该知识点来自沪江网校《英语零基础直达大学六级全能畅学卡【现金奖励班】》的课程，想要更系统的学习，欢迎进入课程学习。不仅可以和更多的同学一起学习，而且还有老师、助教随时的学习指导和知识点解答哦。

同学好，
I’ll put this order in for you ladies, and I’ll let you hold on to the menus in case you still have room for dessert.

put in
to formally offer a particular thing to be considered
正式提出，提交
I've put in an application to the college.
我已经向这所大学提交了报名申请。
They've put in a bid for the company/a bid to buy the company.
他们投标购买该公司。
https://dictionary.cambridge.org/dictionary/english-chinese-simplified/put-sth-in?q=put+in

hold on
to manage to stay alive or to deal with a difficult situation
坚持
We just had to hold on until help arrived.
我们只能坚持到后援到来。
https://dictionary.cambridge.org/dictionary/english-chinese-simplified/hold-on

结合上下文，意思是按照两位女士所说的下单，让她们坚持自己的选择（尊重她们点菜的意愿，因为售货员还问她们要不要薯条，但是其中一位说自己还要留着的点胃给甜点）

选择意思时别忘结合上下文，尤其是有好几个意思时。

Have a good day!