borrow延续性动词：keep
How long can I keep this book?
我能借这本书多久
Her grandchildren keep her young.
她的孙子孙女让她保持年轻。
I work out regularly to keep fit.
我经常做运动以保持健康。
My family helps to keep me centred.
家人帮助我保持冷静。
I kept telling myself to keep calm.
我不断叮嘱自己要保持冷静。
I'm very sorry to keep you waiting.
对不起，让你久等了。
