My mom is always bad-tempered when I leave my room untidy.
Giải chi tiết:
bad-tempered = easily annoyed or irritated : dễ dàng tức giận, phát cáu
Around 150 B.C. the Greek astronomer Hipparchus developed a system to classify stars according to brightness.
Population growth rates vary among regions and even among countries within the same region.
Biogas can be utilized for electricity production, cooking, space heating, water heating and process heating.