然而，有关“巨蛙”的最新发现表明，马达加斯加和南美洲之间曾经由一条大陆桥连接，直到恐龙时代后期消失。

However, the giant frog finding suggests that a land bridge between Madagascar and South America remained until late into the dinosaur age.

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在后期双著绿点染色体将形成一个桥，无著绿点染色体单体形成一断片，此两者均可记录下来。

At anaphase the dicentric chromatid will form a bridge and the acentric a fragment, both of which can be scored.

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自架设体系的后期结构或后层是靠已修结构来支撑，从而逐步完成全桥施工的。

The later part or structure of the self-installing system is supported by the built structure and the whole bridge is constructed progressively.

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