1. The region of smoke flow of the fire has been measured by making use of tracer tick.
研究火灾燃烧烟气流动规律，对于掌握初期形式为燃烧的单炕道的火灾的发生和发展，以及爆炸后有持续燃烧的火灾发展规律，具有十分重要的意义。
2. Malfoy turned the parchment back over and began working his way down the list, making a tick every so often.
Malfoy 翻过那张羊皮纸，开始从上往下研究那个名单，然后动不动的就在上面做上个记号。
making tick的解释
3. I will get a tick out of making friend with you!
如果能和你交个朋友真的很高心！