A chest X-ray revealed that Billy's lungs were fine, "which meant his heart wasn't."上句中的were为什么不用are,Billy的肺以前好,现在也好,但为什么不用一般现在时态?用了were,是说明以前好,但现在不好了吗?谢谢老师的解答。(一...
That's the advice from a new study that finds that people who sit for extended periods of time without taking short breaks are at higher risk for heart disease than those who take more frequent timeouts to stand up and walk around.想问一下timeout在这什么意思?
You either starve to death of live like Robinson Crusoe,wating for a boat which never comes.请问老师,这里的 wating for ...这个动作究竟是主语发出的,还是鲁宾逊发出的? 在这里还能看作伴随状语吗?