词汇:</p>backpack/5bAkpAk/n.背包 watt/wCt /n.瓦(特)
4 C& `$ _5 V# I7 P0 f& lreceiver/ri5si:vE(r)/n.接收机 gait/eit/n.步态,步法. Z/ G* o' I+ A
night-visiongoggle 夜视镜 oscillation/7Csi5leiFEn/n.摆动
+ J- |. S5 T) X5 Y* k7 Yspring/spriN /n.弹簧 commercialize/kE5mE:FElaiz/v.商业化! |. p! j4 P/ \$ q
vertical/5vE:tikEl /adj.垂直的 mountaineer/7maunti5niE(r)/n.登山运动员, M: j7 T2 u5 P
rotary/5rEutEri /adj.旋转的
. F0 [" o0 E/ x1 c& ?练习:
+ |0 x3 n# j0 s9 [+ @1 f1. Backpacks are convenient because% L# x$ Z; `; X
A they can be verylarge.
: d2 h9 [8 a& S( a! iB they can hold as many things as you want to carry.
! C3 \" `# _9 K4 |: _' `# }0 TC your handsare freed to do other things.+ ~! y! a: V4 J! t
D you do not have to carry things withyou.
+ T: @1 z. Y# B9 o2. What is the most important feature of the backpack invented byLawrence C.Rome
; M2 o8 M, N) x8 @/ B* U/ o Vand his colleagues?
: A( i4 s" l5 T- oA It produces electricity forelectronic devices while the wearer walks.# r0 `4 A8 [& e' i% L8 u8 y8 h
B It can be used as cellphones,GPS in the military actions or field studies.
5 c* U% U+ _5 `C It is small andconvenient.) U* @, ]* a6 g+ f! l7 s& W' _) c
D It is light and easy to carry.
$ G' l/ n# t- V+ Z7 |; s4 _7 C! d3. The word "springs" inParagraph 3 means0 p% d8 P9 T$ ^. [
A a small stream of water flowing naturally from theearth.
. W7 m! |/ Z2 k, gB the season of the year,occurring between winter and summer.
. R+ X L& K" H6 @% x; Y0 qC the act or an instance of jumping or leaping.
! R0 v$ _& v5 B6 B, U0 c7 w3 WD a length of metal woundaround,which returns to its original shape after
& T5 l8 a) `5 \being pushed. |