简单。
Obviouslyyouneedtobelyingdowntodothis、当然，做这个放松的时候，人需要平躺下来。
ButfortheshortoftimewejusttesttheLangecouplerandthelownoiseamplifier，moreworksuchbuggingandtestneedtobedowninthefuture、由于时间的关系，目前仅进行了兰格耦合器搜趣网和单级放大器模块的测试，进一步的调试和改进将在以后进行www.souquanme.com。

We're going down a mountain
我们正在下山。
2 He managed to cling on to alXAhK ledge 40ft down the rock face
他设法紧紧地攀在了距岩壁顶端40英尺的岩礁上。
3 She was still looking down at her papers
她仍低头看着文件。lXAhK
4 Danny put down his glass
5 They set off at a jog up one street and down another
他们开始沿着一条又一条的街道慢跑。
6 I went down to L.A. all the way from Seattle
我从西雅图一路南下到洛杉矶。
7 People are down the pub, getting drunk
人们在酒吧，喝得烂醉。
8 Interest rates came down today
今天利率下调了。
9 Thirteen months down, twenty-four years to go.
过去了13个月，还有24年。
10 I was a soldier down to my shoelaces.
我是名不折不扣的军人。
11 The poor man's down to his 搜趣网last £ 3.
那个可怜的人身上只剩3英镑了。
12 Any mistakes are entirely down to us
任何过错全是我们造成的。

come down
1. 下降，落下：
例句: Her temperature came down in the evening.
到了晚上她的体温就降下来了。
Please come down to the office.
请到办公室里来一下。
2. (物价等)跌落：
例句: The price of coal has come down this week.
本周煤价跌落下来。
3. 下(雨、雪等)：
例句: The rain came down in bucketfuls.
大雨倾盆而下。
4. 崩溃；掉下；垮：
例句: The roof came down on our heads.
屋顶掉下来砸在我们头上。
5. 由城市等大地方到乡下等小地方：
例句: He came down from Shanghai last year and settled in the village.
他去年从上海来到农村定居。
6. (吸毒、醉酒后)清醒过来

calm sb. down 让sb.冷静下来

放在词组中间的sb. 应该是代词的宾语形式，例如yourself（祈使句对第二人称用反身代词）, her, him, them 等等。