technologies, such as different types of radar and photographic equipment carried by airplanes or spacecraft, allow archaeologists to learn about what lies beneath the ground without digging. Aerial surveys locate general areas of interest or large...
如为并列关系,须用并列连词,如and, or, but, so, for, while等; 如为主从关系,须在从句之前加从属连词,如since,because,if等; 否则,两句要用句号、分号、问号或感叹号隔开。 3. 主次分明 一个大句里面的两个小句只可能是并列的分句,或主句和从句,不可能都是从句,因此...
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