Give a small gift, if you are able, to your mail carrier or wastecollector and include the Christmas message.
若可以的话，送一份附有圣诞节信息的小礼物给送信员或垃圾清洁工。
2
Waste oil collection methods used previously are analyzed. Structure, working principle and application effect of the waste oil collector improved are presented in detail.
对原来普遍采用的废油收集方法进行了分析，着重介绍了改进后的废油收集器的结构、工作原理和使用效果。
3
To transfer waste from the particulate collector, dilute-phase pressure pneumatic systems are most common, although pneumatic vacuum systems also are being used successfully.