Once on the boat, they were taken below and their chains were fixed to two bars that ran the lenght of the ship.句中，were fixed to two bars中为什么用介词to呢？如何理解这里的to?
The second tack of their argument is to compare the sort of effect seen
in biology-based models of where malaria might spread with both models of and
data on the effects direct intervention against the disease can have.麻烦老师帮忙分析一下句子，特别是这里面的of where, of加在这...
...a thicker, stiffer hose that was difficult to
manipulate, Mary relied more on her trunk. For the purpose of showering Ms.
Kaufmann said, Mary seemed to understand that the bigger, heavier hose was
"just not as useful."这句话最后的as useful是不是有省略？这里的just什么意思？
好像unless后面可以接过去分词。如：Unless it is changed, this law will make life difficult for farmers. 这项法令除非进行修改，否则将给农民的生活造成困难。（Unless changed= Unless it is changed）但是unless 后面也可以接现在分词吗？如：...
老师请看以下句子："The traditional rule was it's safer to stay where you are, but that's been fundamentally inverted," says one headhunter.【我的疑问】it's safer to stay where you are 是表语从句对吗？为什么从句前不需要加that作为引导词？谢...
...候：As you practice this cluster "br", hold out the r, brrrrrrrr....Hold it out of a really long time, not just half a second...请问：Hold it out of a really long time 这一句中，出现了of 怎么回事？怎么分析这句语法结构呢？谢谢老师！
When we feel sad, it's necessary for us to accept sad feelings as part of life. We should learn how to deal with them better than trying to make them disappear.黑体句子中than是rather than省略掉rather吗？翻译是否正确：我们应当学会如何更好地掌控坏心情而不是想方...
请问老师 在例句中 issue后接 with / for / of 时, 它们有区别,怎么来辨别什么时候该用哪一个(是否 of 比较适合)?I had gone through the Serial Number in our system, and it has some issue (with / for / of) its warranty.
...ng young children. 用识字卡教幼儿非常有用。Her three-year-old son is
learning math with flash cards. 她三岁的儿子在用教学卡学数学。Naomi has been using flash
cards to increase her vocabulary. 尚美一直在用抽认卡增加词汇量。Those flash cards have a
questionon...