Dual-trace recorder
[電] 雙軌記錄器
?? 詞語組成解析
dual
['dju(:)?l]
adj. 雙的，兩部分的，二體的，二重的;
n. 雙數;雙數詞;
trace
[tres]
vt. 跟蹤，追蹤;追溯，探索;探索;查找;
vi. 沿著一小徑或道路前進;可以追溯的;
n. 痕跡，蹤跡;微量，極少量;[植]（脈）跡;痕跡;
trace(draw)→回溯
??? 情景例句
You always know the right thing to say.
你說話得體。
If I had known her telephone number, I would have called her.
如果我知道她的電話號碼，我就給她打電話了。
I knew that experts from the local museum would soon visit the cave.
我知道本地博物館的專家會很快到山洞來探訪。