Hxen.com's tips：Every day persisted can learn English well!-->■Learn English Everyday■
kind of〈口〉稍微, 有点儿, 有几分
例句：I'm feeling kind of tired.
我感到有点累。
pretty是副词，在这里修饰important。
2.So far, no studies have proven beyond question that the radio signals from cell phones cause brain cancer or other health problems.
beyond question无可争辩
例句：His honest is beyond question.
他的诚实是毋庸质疑的。
3.But a new study by government scientists in the United States has some people wondering what to think.
has some people wondering
have sth./ sb. doing
现在分词(doing)作宾补，与 sth./ sb. 形成逻辑上的主谓关系，而且这种动作往往具有持续、进行的含义。如：
The two men had their lights burning all night long.
那两个人让灯通宵亮着。
They tried to have her talking. But no use.
他们想让她说话，但没用。
另外，还可用句型 Won't/ can't + have + sb. + doing sth.，表示不允许或禁止。如：
I can't have them wasting their time in this way.
我不允许他们这样浪费时间。
I can't have you catching cold. Run and change your wet clothes.
我不能让你着凉。快去把湿衣服换掉。
4.After that, the people were tested with both phones turned off.
turn off(把…)关掉
例句：The tap won't turn off and there is water all over the floor.
水龙头关不上, 满地都是水。
He turned off the water.
他关上了水龙头。
