查询词典 touch down

a waste of time：浪费(自费)时间

55.up and down 上上下下;来来回回 | 56.a waste of time 浪费(自费)时间 | 57.write down 写下...记下...

account for 1：占去 2.解释

hold down (使)保持低水平,(使)不增加,(使)不升高 | account for 1.占去 2.解释 | go down 下降,降低

It all returns to nothing：一切都化为了乌有

tumbling down,tumbling down,tumbling down倒下来吧,倒下来,倒下 | It all returns to nothing一切都化为了乌有 | I just keep我也让自己

It all returns to nothing：一切都化为乌有

It's killing me inside 害我失去生命 | It all returns to nothing 一切都化为乌有 | It all comes Tumbling down Tumbing down.... 一切都落下来落下来........

It all retures to nothing：一切又回归为乌有

tumbling down, 向下跌落 | It all retures to nothing, 一切又回归为乌有 | I just keep,letting me down, 我只能一直 让自己失望,

hold-down anchor bolt：系紧螺栓

hold-closed mechanism 保持合闸机构 | hold-down anchor bolt 系紧螺栓 | hold-down bolt 压紧螺栓

Who knows the answer? Put up your hand：举起

put on: 穿上 Putting on that beautiful dress , she we... | put up: 举起 Who knows the answer ,put up your hand. | put down:写下,记下 I was putting down what I wanted to speak when my teacher went into ...

around the clock：昼夜不断地,全天地 close down 停止播送;控制

arm in arm 手挽手地 | around the clock 昼夜不断地,全天地 close down 停止播送;控制 | arrive at 到达(某地)

bar from: forbid someone from sth. or doing sth：禁止某人做某事

Our choices come down to demolishing the old house or resto... | All the conflicts eventually came down to one. Who could get custo... | 21. bar from: forbid someone from sth. or doing sth. 禁止某人做某事

be down and out：被击倒而停止比赛, 穷困, 潦倒

be doubtful of | 怀疑 | be down and out | 被击倒而停止比赛, 穷困, 潦倒 | be down by bows | 在沉没中

genetic recombination：遗传重组

第三节基因重组和基因杂交基因重组(gene recombination) 遗传重组(genetic recombination):两个独立基因组内的遗传基因,通过一定的途径转移到一起,形成新的稳定基因组的过程.

d-c restorer：直流分量还原器

d-c reinsertion 直流成分恢复 | d-c restorer 直流分量还原器 | d-c ringer 直流电铃