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张老师好，麻烦您解答一下“he was able to see and touch a lion while still in the convenience of the VR studio”这句话中while和still的意思，以及这句话的意思，谢谢！
首先要注意，while后边是一个省略句。状语从句的省略须同时满足两个条件：①主句主语与从句主语一致；②从句谓语含有be动词。据此，我们可以把这句话中省去的主语he和be动词was还原，还原后的状语从句为：while he was still in the convenience of the VR studio.
由此可见，这里while是时间状语从句的引导词，可以译成“当……的时候”，而still可译成“依旧；依然”。这里的VR是virtual reality的缩写，可译成“虚拟现实”。整句话的意思为：他依旧凭借“虚拟现实”工作室里设备的便利，看见并触摸了一头狮子。
张老师好！我在The Hunger Games 2： Catching Fire中看到一句话：… the warmth from the tea has long since leached into the frozen air. 这里的long是怎么用的？作名词还是作形容词？省略了什么吗？谢谢！
这里long应该是一个副词，用来修饰其后的其他副词或连词，常见的搭配有：long ago、long before、long after以及long since。其中long since的英文释义是“If something has long since happened， it happened a long time ago”，即“很久以前”。例如：I've long since forgiven her for what she did. （对于她的所作所为，我早就原谅她了。）而在The Hunger Games 2： Catching Fire中这句话的含义为：茶的热气早就消散在冰冷的空气中了。
Helping others is a habit， ___ you can learn even at an early age.该题设空处如果不用one，用其他引导词的话，应怎样填？麻烦张老师解答一下，非常感谢！
首先可以肯定的是，这里可以填one，说成：Helping others is a habit， one （that） you can learn even at an early age. 此时one作habit的同位语，one后面是省略了关系代词that的定语从句。其次，如果要填入其他引导词，可以填入which，说成：Helping others is a habit， which you can learn even at an early age. 此时which引导非限制性定语从句，指代habit。
He was so foolish ____ his car unlocked.
A. to leave B. that leave
C. as to leave D. for him to leave
张老师，我不明白这道题为什么不能选择A与D。请您解释一下，谢谢！
本题正确答案是C，说成：He was so foolish as to leave his car unlocked. 这里的“so … as to do”常常用来表结果。这句话意为：他当时犯傻了，结果没锁车。注意，这里必须用as to do来与so搭配，而不是to do，因此选项A不正确。选项D不仅少了as，而且for him也是多余的，因为to leave的逻辑主语实际上就是主语he，无须再给出。
这道题如果不用“so … as to do”，还可以用enough to do，说成：He was foolish enough to leave his car unlocked. 或者采用sufficiently说成：He was sufficiently foolish to leave his car unlocked. 还可以用“so … that”或“such … that”，说成：He was so foolish that he left his car unlocked./He was such a fool that he left his car unlocked.
注意，so as to与“so … as to”的用法不同，前者表目的，后者表结果。例如：We went early so as to get good seats. （我们去得早，以便坐到好座位。）