pitch in

动词 pitch in:

1. eat heartily
   同义词：dig in

1. After the christmas dinner, we all pitch in to clean up the house.
   耶诞晚餐後，我们全都动手帮助清理房子。
2. An electromagnetic wave of audio frequency produced by atmospheric disturbances such as lightning, having a characteristically decreasing frequency responsible for a whistling sound of descending pitch in detection equipment.
   啸声干扰一种由于诸如闪电等大气干扰而产生的音频电磁波，具有典型的逐渐减弱频率的特征，该频减引起了检波设备中调逐渐下降的啸声
3. The fans rushed onto the pitch in an excited mob.
   球迷群情激昂，一窝蜂涌进球场。