system
n. a method of organizing or doing something by following rules or a plan; a group of connected things or parts working together for a common purpose or goal
explain
v. to give reasons for; to make clear; to tell about; to tell the meaning
frighten
v. to cause great fear
mail
n. letters, papers and other things sent through an official system, such as a post office
observe
v. to watch; to look at carefully; to celebrate or honor something ("They will observe the anniversary of the day she was born.")
climb
v. to go up or down something by using the feet and sometimes the hands
science
n. the study of nature and the actions of natural things, and the knowledge gained about them
wreck
v. to damage greatly; to destroy; n. anything that has been badly damaged or broken
pipe
n. a long, round piece of material used to move liquid or gas
split
v. to separate into two or more parts; to divide or break into parts
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