A resident wants to renovate his house, so he buys two kinds of wooden sticks with a length of 0.7 meters and 0.8 meters. If you take some of these wooden strips and connect them, you can get wooden strips of various lengths, for example: 0.7+0.7=1.4 meters, 0.7+0.8=1.5 meters. So among the five lengths of 3.6 meters, 3.8 meters, 3.4 meters, 3.9 meters and 3.7 meters, which one is impossible to achieve through the proper splicing of these wooden strips?
一居民要装修房屋，买来长0.7米和0.8米的两种木条各若干根．如果从这些木条中取出一些接起来，可以得到许多种长度的木条，例如：0.7+0.7=1.4米，0.7+0.8=1.5米．那么在3.6米、3.8米、3.4米、3.9米、3.7米这5种长度中，哪种是不可能通过这些木条的恰当拼接而实现的？
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