1.
DDR SDRAM Double Date Rate
上下行双数据率SDRAM
2.
The market fell (rose).
行情下跌（上涨了）。
3.
satellite uplink and downlink services
卫星上行及下行服务
4.
add/drop multiplexer
上行/下行多路复用器
5.
line 3 from the top of the page
本页从上往下数第三行
6.
to navigate up(down)a river
向上游（或下游）航行
7.
navigate up [down] a river
沿河向上游[下游]航行
8.
tumble down the stairs, off a bicycle, out of a tree, over a step, etc
从楼梯上滚下、 从自行车上摔下、 从树上掉下、 绊倒在台阶上
9.
Can you help me take this bag down from the baggage shelf please?
请帮我把行李从行李架上取下可以吗？
10.
up-link and down-link contributions
上行线路下行线路干扰量
11.
HTML automatically adds an extra blank line before and after a paragraph.
HTML会给段落上下加上额外的空行。
12.
HTML automatically adds an extra blank line before and after a heading.
HTML 会给标题上下自动加上额外的空行。
13.
up and down, up and down.
上上下下，上上下下。
14.
{You cannot insert a row above the first row.}Select a row beneath the first row, and then try again.
{无法在第一行以上插入行。}请选定第一行以下的行，再试一次。
15.
To remove the front panel plate from the unit, use the following procedure.
要从本机上取下前面板框，执行下列步骤。
16.
B: Hold on. Let me grab a pen and jot that down in my organizer.
等一下，我拿只笔在我的行事历上记下来。
17.
I must settle down this morning and do the cleaning.
我今天上午必须安下心来进行大扫除。
18.
He's suffering from concussion after falling off his bicycle.
他从自行车上跌下来，脑受了震荡。