| 释义 |
DEFINITIVE EXAMPLES 权威例句〔expiry〕You will have to purchase top-up vouchers to keep the SIM active, and the calling credit has set expiry periods.你需要购买充值卡充值才能保证SIM卡处于激活状态, 此外, 呼叫余额是设定了有效期限的。外研社新世纪〔top sth up〕This is the easiest way to top up your mobile phone.这是给手机卡充值的最简便办法。剑桥高阶〔top〕I need to top up my mobile phone(= pay more money so you can make more calls).我需要给手机充值。牛津高阶 |