当底部没有画线，你能按照正确的方向游泳吗？
Can you swim in the right direction when there is no line painted on the bottom?
然后拓扑异构酶i将P CR产物按照正确的方向连接。
Topoisomerase I then ligates the PCR product in the correct orientation.
按照正确的方向重新安装手轮，使得原先的设置能够显示，并用固定螺栓加固。
Reinstall the handwheel in the correct orientation so that the original setting is indicated and secure with the retaining bolt.
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