383. Other animals, it is true, communicate with one another by means of cries: for example, many birds utter warning calls at the approach of danger; monkeys utter different cries, such as expressions of anger, fear and pleasure.

英語四級譯文:
其他動物通過叫喊聲相互溝通，這確有其事：例如，許多鳥在危險臨近時發出警告的叫聲；猴子發出不同的叫喊聲來表示憤怒、恐懼和高興。

四級詞匯講解:

it is true為插入語。

communicate意為“與……溝通，交流情況”。如:
The police communicate with each other by radio.警察通過無線電相互聯絡。

by means of意為“以…方式，通過…的手段”。如:
The theory is illustrated by means of Power Point.該理論以 PPT的形式進行講解。

utter此處意為“發出(聲音)”。如:
Why do you utter a sign?你為什么要發出嘆氣聲呢?

at the approach of意為“在……將到的時候”。如:
A bird has to give way at the approach of an elephant.大象走過來，小鳥要讓路。