In the experiments of measuring Plank constant by the method of photoelectric effect, the raising point of the volt-ampere character curve of a photoelectric tube to each kind of monocromatic lights can be extracted by 3-ranking step-differential, precisely to 0.
在光电效应法测普朗克常量的实验中，用３阶逐差确定光电管对各种单色光的伏安特性曲线的抬头点，可以精确到０。
The principle of the increase of the nose up pitching moment by opening the drag plate for an airplane has been studied in NH 2 wind tunnel.
在ＮＨ－２风洞中对某机放减速板产生较大抬头力矩的机理进行了研究，通过减速板分离涡场的测量和测力试验表明，抬头力矩主要是由减速板分离涡在平尾处产生较大的诱导下洗角所致，诱导下洗角沿机身轴线向后逐渐减小，减速板前移可以消除抬头力矩。
Kelsey looked up sharply.
凯尔西机敏地抬头一看。
He looked up again at the portrait of Big Brother.
他又抬头看一眼老大哥。
Stationery imprinted with such a heading.
印有这种抬头的信笺
headed notepaper
ph.1. 印有抬头的信笺
He looked up into the gallery again.
他重新抬头看着旁听座。
Romeo looked up at her.
罗密欧抬头看着她。
He stared up for a moment at the sign.
他抬头望了望招牌。
The driver looked up in surprise.
司机诧异地抬头张望。
He looded up in surprise.
他惊奇地抬头一看。
We catch our breath and look up .
我们歇了口气，抬头望去：
However, unilateralism has shown up;
但是，单边主义倾向抬头，
Ruan Ming remained silent and did not even raise his head.
阮明还是不出声，连头也没抬一抬。
Pull yourself together. Hold your head up.
振作起来，抬起头来。
He raised his head slowly.
他不慌不忙地抬起头来。
The sleeping dog awoke and reared his head.
狗醒来了，抬起了头。
Stomach in, chest out, shoulder back, head out.
收腹、挺胸、肩往后、抬起头。
Mr Simon looked up and said,
西蒙先生抬起头来说：
On which Seven looked up and said, `That's right, Five!
这时老七抬起头说：“得啦！