Communication is one of the most important bonds that hold cultural systems together.
A、obligationsC
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An oversight 遗漏 (miss, overslaugh) in proofreading often results in printed errors.
Withlasersscientistscanprobemanyphysicalprocesses,suchascombustion,oncebeyondourken.视野
The first important exposition in the United States was held in Philadelphia in 1876.
Somechildrendisplayanunquenchable难以抑制的curiosityabouteverynewthingtheyencounter.
The flower bud of a water lily 百合 opens at sunset since .its opening is triggered(commence) .by the decreased light.
