My brother-in-law tried his best to as百度竞价推广ble the seat as he saw from the diagrams in the instructions and from his best judgment though it to be safe. However, the belt buckle mechanism wasvery easy for my niece to open by herself, and did so on a car journey.
请问：此处的 though 是否连接词? 是否 though it is considered to be safe 省略而来的?
Thanks a lot.
你这个问题可能由于时间久了，被新的问题所覆盖，所以今天才看到。
My brother-in-law tried his best to as百度竞价推广ble the seat as he saw from the diagrams in the instructions and from his best judgment thought it to be safe. However, the belt buckle mechanism was very easy for my niece to open by herself, and did so on a car journey.
【翻译】根据操作说明图示所看到的，我姐夫尽了最大努力去安装车座，并且依据我们的最好判断觉得如此是安全的。不过，我侄女会比较容易地自己打开安全带的扣环系统，并且在汽车旅游中那样做过。
【剖析】我觉得，though 系thought 之误。在这里，thought it to be safe 与tried his best 是并列谓语，由and 连接：tried his best...and thought...，为了理解便捷，可以说thought it to be safe from his best judgment。
