当meanwhile?代替and 时，应该前后用逗号隔开，例：
I continued working,meanwhile,he went out shopping.
I continued working and he went out shopping.
我继续工作，与此同时，他出去购物了
：meanwhile
adv.
1
also?informal meantime
同时；与此同时?
while sth else is happening
Bob spent fifteen months alone on his yacht. Ann, meanwhile, took care of the children on her own.
鲍勃独自在他的游艇上待了十五个月。在这段时间，安一个人照顾孩子。
2
also?informal meantime
其间?
in the period of time between two times or two events
The doctor will see you again next week. Meanwhile, you must rest as much as possible.
医生下周还会给你看病。在此期间，你一定要尽可能多休息。
3
（比较两方面）对比之下?
used to compare two aspects of a situation
Stress can be extremely damaging to your health. Exercise, meanwhile, can reduce its effects.
压力会严重损害你的健康，锻炼则可以减少这些影响。
牛津词典 meanwhile