Weather conditions can change quickly, making preflight briefings obsolete.

天气状况变幻莫测，使得飞行前的天气信息失去时效。

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They can't cover all possible weather conditions which tend to change quickly.

它们不能覆盖所有的天气情况，天气变化太快了。

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Firstly, during the period of open loop control, system traces the change of LPG injection of engine quickly by checking the pre-set two-dimension MAP if conditions of engine are changed suddenly.

首先，在开环控制部分，如果发动机发生突变，系统利用制好的二维MAP图查找所需喷气量，快速跟踪发动机喷气量的变化。

youdao

Firstly, during the period of open loop control, system traces the change of LPG injection of engine quickly by checking the pre-set two-dimension MAP if conditions of engine are changed suddenly.

首先，在开环控制部分，如果发动机发生突变，系统利用制好的二维MAP图查找所需喷气量，快速跟踪发动机喷气量的变化。

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