我把被测试的树枝放入这个试管，将一支量角器的零刻度线对准第一个侧枝。
When I put a test branch in the tube, I aligned the zero degree mark on one compass to match up with the first offshoot branch.
我把被测试的树枝放入这个试管，将一支量角器的零刻度线对准第一个侧枝。
When I put a test branch in the tube, I aligned the zero degree mark on one compass to match up with the first offshoot branch.
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